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Operator
Good afternoon. My name is Francis, and I will be your conference operator today. At this time, I would like to welcome everyone to Virgin Galactic's Fourth Quarter and Full Year 2022 Earnings Conference Call. (Operator Instructions) Thank you.
I will now turn the call over to Eric Cerny, Vice President of Investor Relations.
Eric Cerny - VP of IR
Thank you. Good afternoon, everyone. Welcome to Virgin Galactic's Fourth Quarter and Full Year 2022 Earnings Conference Call. On the call with me today are Michael Colglazier, Chief Executive Officer; and Doug Ahrens, Chief Financial Officer. Following prepared remarks from Michael and Doug, we will open the call for questions. Our press release and slide presentation that will accompany today's remarks are available on our Investor Relations website.
Please see Slide 2 of the presentation for our safe harbor disclaimer. During today's call, we may make certain forward-looking statements. These statements are based on current expectations and assumptions, and as a result, are subject to risks and uncertainties. Many factors could cause actual events to differ materially from the forward-looking statements made on this call. For more information about these risks and uncertainties, please refer to the risk factors in the company's filings with the SEC filed by Virgin Galactic from time to time. Readers are cautioned not to put undue reliance on forward-looking statements, and the company specifically disclaims any obligation to update the forward-looking statements that may be discussed during the call. Please also note, we will refer to certain non-GAAP financial information on today's call.
With that, I would like to turn the call over to Michael. Michael, go ahead.
Michael A. Colglazier - CEO, President & Director
Good afternoon, everyone. I'm pleased to host today's Q4 earnings call. And as we get started, I'd like to acknowledge how great it is to have our mothership, VMS Eve, back home in Spaceport America and on the path to bring our first spaceship, VSS Unity, back to space. Eve returned to the skies 2 weeks ago, and the ship flew back to New Mexico yesterday. We are making good progress on validating the enhancements made throughout 2022, and we remain on track for commercial service in Q2 of this year.
Our agenda on Slide 3 starts with a brief recap of 2022. Before moving into our commercial readiness efforts, we will discuss progress on our future fleet development and I'll then turn the call over to Doug to provide a financial review before opening the call to take questions.
Turning to Slide 4. In 2022, we made important investments in the infrastructure and the partnerships that will lead us into the future. First, we invested in our near-term operations by improving the durability and capability of our current vehicles to support higher frequency flight rates as we enter commercial service. The largest effort in this area was enhancing our mothership VMS Eve. We replaced and upgraded the launch pylon, which is the structure at the center of the cantilevered wing to which the spaceship attaches. The pylon not only gives the spaceship a secure ride to launch attitude, but it also regulates the cabin temperature, air quality, power and data connections during maiden flight. In addition to the work on the launch pylon, we fabricated and installed new horizontal stabilizers, and we made numerous enhancements to our avionics and mechanical systems. While this comprehensive work on Eve took longer than we originally planned, we have now completed our enhancements, and I am incredibly appreciative of our team for the long hours that they put in to return these ships to flight. The work we completed in 2022 will serve us well for many years ahead.
Second, we invested in our supply chain and spaceship fabrication infrastructure to enable our business to scale profitably. 2022 saw us bring on experienced design and manufacturing partners to fabricate our major subassemblies. And we also broke ground on our spaceship final assembly factory in Phoenix. Also in 2022, we laid the foundation for an astronaut experience that will be unrivaled. We completed the conceptual design for our first-of-its-kind Astronaut Campus, and we acquired an incredible site for the campus close to Spaceport America that will be reserved exclusively for Virgin Galactic future astronauts and their guests as they prepare for their journey to space.
On Slide 5, as we enter 2023, our near-term focus is on commercial spaceline operations. This includes 3 areas of operation. First, safely fly in our current ships, VMS Eve and VSS Unity, to space on a recurring basis. This is the role of our spaceline missions and safety team. Second, preparing, inspecting and returning our ships and ready for flight condition on regular intervals. This is the role of our spaceline technical operations team. And third, hosting, training, preparing and celebrating our future astronauts, which is the role of our customer operations team. All 3 of these groups are actively preparing to bring our customers to space, and we are rehearsing and making preparations for the launch of commercial service.
In recent weeks, we conducted flights with Eve from Mojave. And yesterday, Eve reunited with Unity at Spaceport America. We are very pleased with the way the mothership has performed in each of these flights, which ensure the modifications that we have made perform as expected under real flight conditions. Our next steps in the validation process will include a series of flights, including a glide flight, where VMS Eve carries VSS Unity to high altitude and releases the spaceship to perform an unpowered glide down to Spaceport America. Following successful completion of those steps, we'll look to conclude the validation process with a powered flight to space that will include a Virgin Galactic crew, who will be assessing the in-flight experience and verifying components of our ground-based training program. Following successful completion and verification of the analysis from those missions, and consistent with our recent outlook regarding the flight schedule, we expect to commence commercial service in Q2, beginning with a research-focused flight with the Italian Air Force followed by regular private astronaut and research missions thereafter.
In between these validation flights, our spaceline teams are preparing for safe and repeatable flying by executing mission control simulations, training exercises and other dress rehearsal activities with full integration of government agencies and partners at Spaceport America to ensure a seamless flight and astronaut experience. The customer operations team is preparing Spaceport America for the increased flight cadence and delivery of an unforgettable experience for our customers, and they are working through rehearsals and simulations to ensure the astronaut experience before, during and after the flight is truly one of a kind.
Turning to Slide 6. I'd like to share some insights into our future fleet development, specifically, the Delta Class spaceships and our next-generation motherships as these production vehicles will be the key enablers of revenue growth and profitability for the company over the long term. At a high level, this is a multiyear fleet development program that is running concurrently with our near-term commercial operations which utilize Eve and Unity. Our future fleet development road map calls for the first of our Delta Class spaceships to come off the line at our Phoenix assembly facility in time for entering commercial service in 2026. Whereas 2022 was about establishing our design and manufacturing strategy, selecting our primary suppliers and building up our internal teams, 2023 is now focused on completing designs for both the next-generation motherships and Delta spaceships, building the required tooling and beginning the parts fabrication for these ships.
Moving into 2024, we anticipate parts fabrication will continue and the assembly phase for both the next-generation motherships and Delta Class spaceships will also begin utilizing the subassemblies from our suppliers. Ground testing and flight testing is expected to commence in 2025 in preparation for commercial service in 2026.
In conjunction with that road map, we are making progress on our final assembly facility in Phoenix, Arizona. We are currently working through the interior design, production layout and fit-out phases of the project to support initial assembly with parts expected to arrive in 2024. With our road map in place, the teams are working hard to achieve the various milestones that will lead to the scale needed to drive our business in the future.
I'll now turn the call over to Doug for an update on our financials.
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Thanks, Michael. Good afternoon, everyone.
Turning to Slide 7 and our financial results for the fourth quarter and full year. Starting with the fourth quarter, we generated revenue of $869,000 driven by future astronaut membership and event fees. Operating expenses were $154 million compared to $81 million in the prior year period. The increase is primarily attributable to a $62 million increase in R&D costs tied to our fleet enhancement activity and the development work for our future fleet. We reported a GAAP net loss of $151 million compared to $81 million in the prior year period, driven by higher R&D costs. Adjusted EBITDA was a negative $133 million in the fourth quarter compared to negative $65 million in the prior year period.
For fiscal year 2022, we generated revenue of $2.3 million, primarily driven by future astronaut membership and event fees and revenue recognized for research activities. Operating expenses were $502 million compared to $323 million in the prior year. The increase is primarily attributable to a $170 million increase in R&D costs tied to our fleet enhancement activity, the development work for our future fleet and an $8 million increase in SG&A primarily due to higher employee costs to support our growth. We reported a GAAP net loss of $500 million compared to $353 million in the prior year, driven primarily by higher R&D costs. Adjusted EBITDA for the year was negative $431 million compared to negative $245 million in the prior year.
Moving to Slide 8. Free cash flow was negative $135 million in the fourth quarter compared to negative $67 million in the same period last year. For the year, free cash flow was negative $397 million compared to negative $235 million in the prior year. Our balance sheet remains strong with $980 million in cash, cash equivalents and marketable securities. We intend to maintain that capital strength while prudently investing in the business. In 2022, we generated $425 million in gross proceeds through the issuance of convertible notes and $103 million in gross proceeds through issuance of 16.3 million shares as part of an aftermarket or ATM equity offering program. Specific to the fourth quarter, we raised $3.8 million in gross proceeds utilizing the ATM. At the end of fiscal 2022, our issued and outstanding share count was approximately 275 million shares compared to 258 million shares at the end of fiscal 2021. For the first quarter of 2023, we forecast free cash flow to be in the range of negative $135 million to negative $145 million.
As we begin commercial service, we anticipate each flight will recognize the revenue equivalent of approximately $600,000. Keep in mind that the first 6 flights or so will include one of our astronaut trainers, who will be making in-person assessments of the cabin experience and recommending any adjustments to our ground-based training programs as necessary. This will result in 1 less revenue seat during these first flights, after which Unity will carry 4 passengers or research seat equivalents. As you would expect, working through the flight manifest and the reservations that carry higher ticket prices will change the revenue profile of later flights.
With that, I'll hand the call back to Michael for some closing comments.
Michael A. Colglazier - CEO, President & Director
Thanks, Doug. In conclusion, 2022 was a year for investing in our future to support our commercial spaceline goals. We focused on preparing our current fleet for commercial service, mobilizing our manufacturing partnerships to build our future fleet, supporting an astronaut experience that is unmatched anywhere in the world, including setting the stage for a unique astronaut training campus. And we strengthened the balance sheet by raising capital to support the necessary investments in the business that will drive our long-term growth.
We entered 2023 focused on commercial spaceline operations. Near term, we plan to deliver regular and repeated flights with our current fleet and demonstrate the experiential power of our product. Concurrently, we are diligently progressing the development of our future fleet to scale our business over the medium and long term.
With that, we'll turn to questions. Operator, we're ready for the Q&A portion of the call.
Operator
(Operator Instructions) Our first question comes from the line of Greg Konrad with Jefferies.
Gregory Arnold Konrad - Equity Analyst
Maybe just to start, you've earned $135 million of free cash flow in Q4. The guidance for Q1 is at a similar level. And I appreciated the granularity of kind of the Delta plan. How are you thinking about peak free cash flow usage? Is Q1 and Q4 a good run rate? Or is there some accelerators in there? And just 2023 in general, is that kind of the peak?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Thanks, Greg. This is Doug. So yes, we guided $135 million to $145 million of negative free cash flow in Q1. And so you can see that's just slightly up from Q4. What we're seeing right now is the ramp down of the effort on the enhancement period. So there's some reduced spending in that area, while at the same time, we're picking up the spending on the fleet development activities. So this is building out Delta Class and the next-generation motherships, so the design work in particular. So what you'll see now is that starts to ramp and going forward, there will be some increases because we have the efforts on the fleet development as well as some infrastructure to go along with that.
But the thing is we do have some flexibility in how we pace ourselves in this ramp. So while it increases, we can either continue to accelerate or slow down as we see fit. We do see very attractive returns on all of these investments. So we want to lean into these opportunities as much as we can, but we do have the opportunity to slow the pace if we need to, to preserve cash or something like that. But we do see attractive returns. We want to invest in those things because we think it will generate great economic benefits for the shareholders. With all the moving parts between the fleet and the infrastructure, it's a little hard to put a number on the exact peak spend, but I wanted to give you kind of a directional guidance there on what to expect.
Gregory Arnold Konrad - Equity Analyst
Appreciate that. And in the prepared remarks, you mentioned regular intervals. I guess, how far out in advance do you plan missions? And when you think about that first commercial flight in Q2, can you reach kind of that one flight a month right away? Or is there kind of a learning curve or ramp to generating that kind of regular interval?
Michael A. Colglazier - CEO, President & Director
Greg, it's Michael. I think I would be kind to our spaceline technical operations teams to let them get a couple of flights under their belt just to kind of work out the kinks there. But in speaking with that group, it's very capable. We see a path to be on a monthly cadence in reasonably short order. So give ourselves 2 or 3 to kind of work that out, but there's nothing kind of specifically in our way of being at a monthly cadence. I think it's just kind of shaking out the operation and learning how to turn the ship on a consistent basis. So we have our plans in place, we're rehearsing them now actually now that we've got those ships together. So a few flights to kind of check it out, and we should be on that target.
Gregory Arnold Konrad - Equity Analyst
And then just one last one for me. I mean I don't think you mentioned Imagine at all in the script. Any update there or how you're kind of thinking about that spaceship?
Michael A. Colglazier - CEO, President & Director
Yes. Same as where we were last call. So I've specifically directed all of our team members on 2 primary groups of work, right? First is leveraging Eve, our mothership, that just made back to Spaceport America with Unity, and let's just start hitting regular flights to space, do so safely, do so exquisitely and create incredible experiences for people. I think that's going to be very powerful in showcasing to the world the power of this product. So that's priority 1. Priority 2 is the work that's going to create the value drivers for the company, and that's getting a production vehicle that has relatively low variable costs so that we can bring money to the bottom line. That's the Delta Class spaceship and the next-generation mothership. And I've moved everybody in the organization and support teams onto those priorities. So that leaves Imagine in, I'll call it, an idle capacity right now. And it's okay there. We're going to make sure we have both of those aforementioned scopes of work just dialed in and well in hand. And when that happens, we'll come pick up Imagine and see where we want to go. But for now, we're leaving it at an idle capacity.
Operator
Our next question comes from Oliver Chen with Cowen.
Oliver Chen - MD & Senior Equity Research Analyst
Michael and Doug, you have a really great consumer marketing talent. I would love [your] thoughts on pre and post commercial flight customer engagement strategies and how you're contemplating that. Also, as we look forward longer term, is 400 flights per spaceport the right parameter still as you scale? And then as you think further in advance, how are you thinking about international operations as well?
Michael A. Colglazier - CEO, President & Director
Thanks, Oliver. So I'm not sure on the customer topic, you're more interested in what our astronaut experience will be as we start off or more long term?
Oliver Chen - MD & Senior Equity Research Analyst
Customer lifetime value and optimizing the membership once the customers experienced it, but both topics are great.
Michael A. Colglazier - CEO, President & Director
Got it. Okay. No, thank you. As you well know, we have an incredible group of what we call future astronauts. We'll be bringing more and more of those people in, they're very interesting people and very passionate people about what we do. In the notion of customer lifetime value, we're starting the journey with these folks, some, many, many years, but our plan for anyone we bring in will be a 2- to 3-year journey, very specifically building to the moment of the space flight so that we can anchor that memory in. And in addition to just paying off the effort and delivering on the product, I think that experience is going to be so compelling that these folks become our, by far, strongest advocates, not only in recommending to other people to come, but I think will be wanting to come back and fly with us again in other places.
And I'll jump to international for a minute and then come back to the 400 flights. The notion of flying -- everybody who's gone has kind of come up and said, "I would like to go again," to a person that's gone with us. So I think that is going to continue. I think people want to bring friends and family along the way. And that can happen in the same location. I think it will also be very powerful to see other parts of the earth from space. You often heard us talk about, wouldn't it be amazing to look down over the boot of Italy or over the sea of Japan or other places. So that international spaceport concept is very important and strong for us, which is why we're building a factory in Phoenix that can continue to produce spaceships, not only for Spaceport America, but that can continue to populate additional spaceports. So we've always said that's probably a 4- to 5-year exercise to be into a new spaceport, my guess, probably closer to 5. And we thought we would be going back and reaching out to interested countries in that regard around the time we're coming back to flight. So I think that existing strategy still holds today.
The 400 flights per year for spaceport is a very important planning parameter for us. We're building our capacity across all the different parts of our business around that objective. We could do more or we could do less, right? We're generally saying, let's go out on daily flights and realizing that weather won't always cooperate with us as it did in this last week. It took us a few days to get out of Mojave with our mothership due to the weather in California. We also want the ability to fly more than once a day at a particular spaceport. So once we have that capacity in mind, conceivably, we could do more than 400 flights at a specific spaceport. But I think we'll probably first look to leverage multiple locations in other parts of the world. But we do have that flexibility to go higher if we so chose.
Oliver Chen - MD & Senior Equity Research Analyst
Okay. Last question on the Delta Class production, which is very important for scaling. What are the milestones or critical points we should think about and the R&D spend growth over the next few years? Are there things we should be aware of?
Michael A. Colglazier - CEO, President & Director
Thanks Oliver. So just a little bit more color on the milestones around the Delta Class as an example. So this year, we'll be completing designs for the ship and actually building the tooling for the parts, and we will be starting parts fabrication. Now the parts we'll be doing in 2023 are the kind of big longer lead outer mold line, which is already consistent parts. So that would be in the fuselage, the skins for the spaceship itself, the foundation, all parts of the wing, the parts of our feather assembly. So those will actually start this year, later in the year, because we're still putting the designs and locking those down. But those will actually start after we build the tooling and then get that parts fab going. In 2024, you'll see parts fabrication continue, but we'll then start the assembly of the ships in 2024. And that then wraps up so that when we get into 2025, we're doing first ground and then flight testing on the vehicle. So those are the details that are going through there. We've got our supply chain partners signed on and already working with us in this regard.
But you'll want to -- as we keep coming back quarter after quarter, all right, how are those designs progressing, right? When are you starting the tooling on that? Is parts fabrication still looking kind of at the tail end of '23? Those will be milestones that will be checkpoints for making sure that we're continuing on the path to commercial service in '26.
Oliver Chen - MD & Senior Equity Research Analyst
Just lastly on that R&D question. Anything we should know for the modeling? And also is it -- it goes to CapEx, is that correct from an operating expense over time?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Oliver, this is Doug. Yes, so we are in the design phase now. So you'll see nonrecurring engineering costs as we develop the first article and then we'll be investing in the tooling and the parts fabrication. So you'll see the spending ramp up there. It does shift over to CapEx once we reach a certain stage of the finalization of the design and then we'll do the accounting adjustment to switch over to CapEx. So you'll see a change there. In terms of the magnitude of it, we've got 2 main suppliers helping us with the Delta Class. And the way we've set up these contracts is it's a set of task orders that are under development. And we're doing what people would refer to as a rapid aircraft development program, where we do a lot of steps in parallel. So we're doing things concurrently. So we develop each of these cost estimates for the subsequent task orders as we go. And we have the model, of course, but it wouldn't be in our best interest to put those numbers out there right now because they're still under negotiation with our major suppliers. So hopefully, you can understand that.
Operator
The next question comes from Emilee Deutchman with Wolfe Research.
Emilee Meredith Zox Deutchman-Blaschke - Research Analyst
Just a quick question. So first on headcount. Where did headcount arrive at the end of the year? And secondly, with that, how are you all thinking about the pace of hiring in the next year?
Michael A. Colglazier - CEO, President & Director
Headcount, we ended last year -- I'm talking to Doug here, as I don't have that one on my fingers, I thought 1,100, 1,200 or so on a headcount basis for the company, and we'll do a quick double check on that one, but I think that's about right. And last year was definitely a growth year for us in adding headcount as we ramped up our team. We have a few places left to continue to build. So we're still in somewhat of a growth mode, but we've hired the majority of the people and the roles that we need to carry us both in commercial operations and on the development path, kind of our programs in engineering and developing these new ships. Now our partners, right, they'll be building up their teams or reallocating folks from some of the larger companies will be reallocating as our work starts to flow to them. And that will happen.
But what we're also able to do is now is as we've finished the work on our enhancement program with Eve in particular, we're able to redeploy the talent that have been occupied on those efforts into our operating areas, so both into our kind of spaceline technical operations in New Mexico, but also into helping as we get into final assembly in Phoenix. So I'd say modest growth in a few targeted areas, mostly engineering. When we get into the 2024 period in Phoenix, and we really start our assembly processes there, that particular site will ramp up further as we go, but for '23, modest growth.
Douglas T. Ahrens - Executive VP, CFO & Treasurer
One other thing I can add there is that with the headcount, we did have a lot of contractors here during the enhancement period. So as that has completed, we've ramped down that headcount. And so now you're seeing us add more permanent headcount for the next phase, which is the fleet development. So it's not a net add of heads with the numbers we gave you, but those are the full-time equivalents that will be here while we ramp down the contractors.
Emilee Meredith Zox Deutchman-Blaschke - Research Analyst
And then one more, if I may. On the customer pipeline, the future astronaut pipeline, sorry if I may have missed this in the commentary, but are you able to size that pipeline at the moment? And do you all get as granular as the geographical spread of the customer pipeline?
Michael A. Colglazier - CEO, President & Director
Well, a couple of ways on that. So the TAM, if you will, on this industry is obviously one that's being built because the industry is being built. A couple of your counterparts have done some good research, I think, into assessing that market and kind of leave those works to stand on their own. But we're obviously building this up as we go. The -- you mentioned international on our customers, we have astronauts from over 62 different countries or I think 62, maybe 63 now different countries across the world. So we obviously track our existing base there. And we know where we have kind of greater and lesser momentum. So that brings us to then, as we consider international spaceports, Europe is a logical place for us, Middle East is a logical place for us, Asia is a logical place for us. I feel pretty good about Spaceport America or North America right now. And right there kind of gives you the -- where we think the big markets are aggregated. And obviously, the groups that we're bringing in do travel and are willing to travel to different parts of the world. So I do think we can bring a global audience to any of our individual sites that we'll eventually have, but I think it's helpful to be located in proximity to large markets as well.
Operator
The next question comes from Michael Leshock with KeyBanc Capital Markets.
Michael David Leshock - Associate
So first question, I appreciate the milestones you laid out for the Delta Class. I wanted to ask on which milestone or which year that you laid out, do you expect to be the most capital intensive? So whatever that peak burn rate is, and I know there are a lot of moving parts, but I'm just trying to get an idea for the duration of that rate or what steps would require the larger cash outlays.
Michael A. Colglazier - CEO, President & Director
Sure, '24, right, '24, you'll see the continuation of parts fabrication. The assembly is going to be going on not only at our Phoenix plant for final assembly, but within our supply chain partners for their major subassembly. So that's where you're kind of getting the peak nonrecurring engineering and the peak assembly of initial ships. And then as we move those into ground and flight testing, that would start to come down, we would expect. As Doug mentioned, we have some good capability, I would say, to accelerate or kind of keep the accelerator down or hedge back up on our pace as we feel we need to. We feel really good about the return on investment of the money that we're putting in. And so we would like to go ahead and get this fleet built up and start delivering on the experience. But we have flexibility in that if we need to. But specifically to your question, I think 2024 is likely to be our peak.
Michael David Leshock - Associate
And how far in advance of Delta's first revenue flight do you plan to begin that testing of the Delta ships? You said 2025, but is that a few months? Or is that the better part of the year? And how does that compare to the length of testing for legacy ships? Is that the same amount of testing you needed for Unity, for example? Or can you check a lot of those boxes off for Delta, just given the testing that you've already completed on the legacy fleet?
Michael A. Colglazier - CEO, President & Director
Yes. We don't expect to see some -- Unity was a very extensive flight test because it was breaking new ground almost on every flight. Delta's flight tests are going to be flying similar flight profiles with a outer mold line that's fundamentally the same, very similar to our last ship and -- but with different material properties and some different handling characteristics inside. So the scope of the flight testing is less than what you would see in Unity, but it is a new vehicle. I don't want to put a parameter probably this early on the team of exactly how many months that, that will be. It's measured in months. And I think the focus of that is just, as we always do, a nice sequential test, learn, expand the envelope and analyze, go forward with that. But it is off a much deeper base of knowledge. We'll also have many flights under our belt by that time that have also built up our knowledge, and we're able to do a lot more modeling, right, with our aerodynamic models and our flight sciences group that also helped, I could say, make that as an efficient process as we can.
The other thing we can do by virtue of having built tooling and getting that nonrecurring engineering done with the tooling is we can have more than 1 ship embedded into the flight test program. So that's something that we're evaluating now is being able to kind of work on different points with multiple ships in the process there because it doesn't take us relatively that long to do a final assembly on a ship. So hopefully, that gives you a little bit of color into that process.
Michael David Leshock - Associate
Yes. That's helpful. And lastly for me, the issuance of shares through your at-the-market program was minimal in the quarter relative to the $100 million in 3Q. How are you viewing the cadence of any further issuance as we move through 2023, given the $200 million or so remaining?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
We have the $200 million, as you said, there for us to utilize. And it's always -- it's based on market conditions that we're always watching and trying to optimize, and it has to do with things like share price and volume and that sort of thing. So we'll use it appropriately when there's opportunities to do so.
Operator
The next question comes from Michael Ciarmoli with Truist.
Michael Frank Ciarmoli - Research Analyst
Maybe just to kind of stay on that sort of capital spending and CapEx. That means -- so should we basically broadly think that cash burn '23, '24 million should equate to about $1 billion? I mean, is that the right way to think about this?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
So, thanks for the question. As I mentioned, it's not something we want to put a total number on, just because of the number of moving parts in between both the timing and the magnitude of the spend. So I tried to give you directionally what to expect, and we did highlight here that it will be growing most likely into 2024. But there's enough moving parts in there that it's a little difficult to put a total number on it that we want to put out there on a multiyear guidance basis just because you've got the Delta Class plus the motherships plus we have the factory for the manufacturing as well as the spaceport expansion and the Astronaut Campus. So there's enough things in there that are all lining up in terms of being ready for service, yet there's a little movement in there. I think it's -- be reaching to put a specific number out there for a 2-year spend at this point.
Michael A. Colglazier - CEO, President & Director
Yes, I think part of what goes into Doug's [thought] there is we have flexibility on how many of those things we choose to run concurrently or not.
Michael Frank Ciarmoli - Research Analyst
Okay. Fair enough. And then just -- I mean, are you guys comfortable with just having -- I mean, you're going to have 1 ship in operation through 2026? I mean is that -- from an operational risk standpoint and sort of deemphasizing Imagine, are you guys comfortable with that kind of model?
Michael A. Colglazier - CEO, President & Director
Well, one, we're -- I'm very excited and comfortable with Unity and excited to have the mothership back there so we can get that going. So that's just all good news. Second thing is we want to really get the volume of this up. That's what we're all in this company for is to take hundreds and then thousands and tens of thousands, eventually, people in space is where we're trying to go to. And that requires a production model. So that's why you're seeing us focus first on Unity, so that we can just regularly prove out and showcase the experience. We'll continue to learn technically, of course, but I think it's really going to help normalize to the marketplace and showcase the power of what we do. But we really are needing to get focused to the production model. So that puts Imagine as an option value in the middle. And we can turn to it when we've got everything else well in hand and coming long as we want to and then come back to Imagine. But we look here to have our Delta ships beginning flight testing in 2025. And that's a couple of years out now, it's still to come, but we're moving well ahead on that. I think we'll get all of our learning on Unity. So it's helpful to have Imagine as that option to go to when we want to go to it. But first things first, let's deliver our experience with Unity and let's make sure that we're building out the low variable cost production unit in Delta.
Michael Frank Ciarmoli - Research Analyst
Got it. Sounds fair. Last one, I guess, or maybe 2 quick ones. Is there any FAA certification needed or required for the modifications that were made to Eve? Is that part of the validation?
Michael A. Colglazier - CEO, President & Director
Right. So 2 different things. We have a commercial operator's license. We talked about that, I think, on the last call, and that's good through July of 2024. I think those go on 2-year renewals. And then each of our ship has an experimental airworthiness certificate. In fact, Eve just renewed hers. And so that's a yearly basis. We'll go and renew Unity's later this year.
Michael Frank Ciarmoli - Research Analyst
Okay. Perfect. And last one, I think the customer deposit [on the] ticketed passengers and backlog or any trends there?
Michael A. Colglazier - CEO, President & Director
I'll just -- in the general trend, so we are kind of at the same place where we've been before. We've right around 800 or so people on board in the future astronaut category. We pulled 100 of our first 1,000 seats off to use for research that we're going to, call it, feather in to the manifest along the way. And we'll start by seeing the Italians on a research flight first up in commercial service. And then we have a group that we're working with Virtuoso that we've given an allotment of inventory, too. So I think my guess is Virtuoso will probably pick up on their efforts as we move back to space. So no real changes in that category. We saw, on last year 2022, some people of our 800 base drop-off, wasn't our largest year dropping off, as you might imagine, with everything and the disruption going on in the economy in the world. It was a bit higher than some. And we generally backfilled that with what I refer to as house seats, friends and family referrals from existing future astronauts that kind of kept our overall numbers basically the same.
Operator
The next question is from Kristine Liwag with Morgan Stanley.
Kristine Tan Liwag - Equity Analyst
Following up on Mike's questions earlier on cash, if we annualize your 1Q cash guide that could be a free cash flow usage of $560 million per year, you guys have a $980 million cash balance, so that would only leave you with $420 million by year-end. Doug, you mentioned that you can accelerate or slow down investments to preserve cash. Can you quantify the flexibility? Is that in the tens of millions or hundreds of millions? And maybe I'll stop there. And I've got a few follow-ups on that.
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Yes. Thanks, Kristine. This is Doug. Yes, the ability to flex our spending is actually pretty significant. It's more in the hundreds of millions range versus tens. We'd rather not do that because we see great returns on these investments, and we want to invest in the vehicles and the expansion because the economics of producing more ships is very attractive, right? Because each copy is relatively inexpensive compared to the engineering and the work that we do up front. So we want to be able to make these copies, get those economics running. So we'd rather not slow down, but we could if we needed to and spend less on the infrastructure and the fleet development as needed. So we have some pretty significant levers there in terms of what we could do, if necessary.
Kristine Tan Liwag - Equity Analyst
Great. And is there a minimum cash balance you're comfortable with? And then also when you think about that ramp of those ships, are there other creative financing solutions that you can look to so you can continue to accelerate production without compromising your cash position, maybe like secured asset financing or anything like that? Are those available? Or are these too -- are spaceships still too niche for that?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Sure. So on the min cash, there's not a specific number we have put out there. But we do like having a strong balance sheet for the reasons I mentioned. We see great opportunities in the investments we have. We want to have that flexibility. So our preference clearly is to maintain that strength and not let it shrink. So we will strive to do that. But I wouldn't put a specific number out there. In terms of alternative financing, there's equity, there's debt. We -- and you mentioned some other secured methodologies. We haven't pursued that at this stage because we have the $980 million. We have the flexibility we talked about. The equity markets have been supportive. We were able to raise debt before, and we have that potential again in the future, and we'd look to that as an alternative. But we can explore other alternatives if we want to get more creative. But at this stage, it's kind of sticking to the basics.
Kristine Tan Liwag - Equity Analyst
Great. And if I could squeeze one on Eve. I mean, you've now had 2 successful test flights. How is the operating data comparing to what you anticipated? Are there any surprises? And is 100 flights before the next major maintenance overhaul still where it's tracking?
Michael A. Colglazier - CEO, President & Director
So great questions, Kristine. The -- just because it's a broad call and people listening in, we're using the word verification or validation flights. What we're doing here with Eve is not trying to break new ground. These are fundamentally regression testing flights. So we use them to gather actual flight data. We use that to correlate our flight sciences models because we made some structural shifts within the plane, right, specifically in the center wing where we made a heavier and beefier launch pylon, there's some different structural strength in that part of the wing and there's some actual small elements that have changed slightly kind of the profile of the wing. In fact, if you look in one of our slides, whatever slide number it was, where we kind of showed the launch pylon and the horizontal stabilizers, if you look closely in that, you'll see a couple of small protrusions on the leading edge of the wing. There's same on the back. We use what we call an exoskeleton approach to add -- be the way that we would attach the pylon on to the wing. And that created a little bit more material in those areas. And so what you're seeing on those protrusions are its farings, very small farings.
So we don't expect those to have any impacts, and we're using these tests as an example to confirm that there's not any material aerodynamic impact to that. So those tests have gone very well so far. We continue to do them sequentially. The next flight, we will use to kind of continue to expand if we've done regression testing to gather data. We're also looking to ensure that nothing that we did would create an opportunity to introduce any flutter characteristics into this area. So that -- we work our way up to that. So that's what these first 2 flights have done. We'll do another flight and carry it out to max speed in that regard. But we've been very pleased with the performance of the ship. It's correlating as expected. We're just going to continue on that process now. Pilots had nice things to say, which was good to hear.
Operator
The next question comes from Austin Moeller with Canaccord.
Austin Nathan Moeller - Associate
Just my first question here, just given the cash that you have on the balance sheet and the plans for production through 2026, do you expect that to yield 1 Delta Class suborbital space plane and one next-generation mothership? Or do you expect additional units that you should be able to produce with what you have on hand?
Michael A. Colglazier - CEO, President & Director
Well, let's see, Doug, yes, you can kind of -- we can tag team on this one. I'd frame the start of this, Austin, with, our strategy is to invest a nonrecurring engineering work, both in the engineering design and in the building of tooling that allows us to build parts in an ongoing basis and a final assembly infrastructure that allows us to continue to assemble copies of this production model -- both of these production model ships at relatively -- quite relatively low variable cost. That's where we'll get the economics. That's where we'll drive the margins in the business. That's where we're going to flow through from a shareholder value standpoint. So that's the same on both -- that approach is the same on both the Delta Class ships and our next-generation motherships. And both of these internally as well as with our supply chain partners, we're creating the tooling and doing that in kind of long wear tooling, such that we can go ahead and continue to create replicas of those as we both build out Spaceport America and then look even further ahead into being able to continue to populate spaceports in other locations in the world. So that's been our manufacturing strategy all along.
So obviously, as we get into those ramp-up years, we'll also be flying ships and then you have more income coming in and so that you can kind of balance that on an internal cash generation basis. So going forward, Doug, you shared a lot on economics. I don't know if you have anything else you'd want to add?
Douglas T. Ahrens - Executive VP, CFO & Treasurer
Just regarding the cash we have and then the cost of the vehicles, I think it's getting too close to quantifying the cost of a spaceship and the mothership at this stage, given what I mentioned about the negotiations that are ongoing. So I think we'll go with Michael's description as the color he just gave is hopefully helpful to you.
Austin Nathan Moeller - Associate
Okay. And then just another question. The Astronaut Campus is being built in New Mexico by 2026. But just thinking about incremental revenue opportunities for the company, have you guys considered doing like a [Rose Cosmos] Star City style astronaut training service to help add to revenue generation, just in addition to the actual space flights?
Michael A. Colglazier - CEO, President & Director
I think -- just so I say the same thing to you that I'm saying to everybody in our team at Virgin Galactic, right, we're first going to stay focused on flying Unity to space with Eve and second on getting our Delta Class and next-gen motherships up. So that is very clearly where we're putting our attention right now and being super efficient with our spend as we do it. So with that said, I think there's a lot of opportunity for widening out our revenue potential as we start to get regular flights to space. But I do think the heaviest bulk of getting the leverage to have additional revenue streams like the ones you're talking about, really get enabled as you start to get closer to at least a weekly, if not multi-times-a-week cadence there because there's just a lot of excitement, huge emotional excitement just being around and seeing our ships go to space. And we can -- you can envision opportunities around that, that would be at materially smaller price points, of course. But I think that's for the future a little bit right now. We just want to stay focused in 2023 on getting the job done with Unity and Eve and getting our Delta Class and next gen motherships going.
Austin Nathan Moeller - Associate
Okay. And then just one more, if I may. Have you had any customers come to you through the marketing process that have complained about the high pricing on Blue Origin's suborbital flight relative to yours?
Michael A. Colglazier - CEO, President & Director
Our customers are amazing people. Some people are observing their multiple choices in the world. I think we're excited for everybody to be going to space. So I won't comment on relative pricing. But I do note that there are different price points as you point out.
Operator
There are no further questions in the queue, so that will conclude today's Virgin Galactic fourth quarter and full year 2022 earnings call. Thank you for your participation. You may now disconnect your lines.