US Fighter Jet Procurement: From Design Board to Deployment

[Signal Witch]

The Aircraft Acquisition Process Explained



When President Trump said the Air Force’s Next Generation Air Dominance fighter is “already flying,” it set off a wave of speculation that the jets were already rolling off the production line. In reality, what is in the air today is almost certainly a technology demonstrator; a test platform built to prove new systems work. Turning that into an operational fighter is a multi-step acquisition process that the Department of Defense follows for every new aircraft, from the first sketch on a designer’s desk to the moment the first combat squadron is ready for deployment. This post walks through that process so you can see exactly what “already flying” does and does not mean.

 

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1. Concept and Requirements
The service, whether it be the Air Force, Navy, or Marines, starts by identifying capability gaps. For NGAD, that means an aircraft that can survive inside heavily defended airspace, control unmanned wingmen, and dominate in air-to-air combat over long distances. These needs become formal requirements that spell out range, payload, stealth, sensors, and cost targets.
 

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2. Technology Demonstrator
Before committing to a full aircraft program, the Pentagon often funds a technology demonstrator, a one-off flying testbed that proves the major systems work. This is almost certainly the aircraft Trump was referring to.
A demonstrator can fly and show off stealth shaping, propulsion, avionics, and weapons integration concepts. But it is not a finished prototype. It is usually hand-built, may lack full mission systems, and is not production-ready.
 

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3. Request for Proposals (RFP)
Once the tech is proven, the service sends out an RFP to industry. Companies like Lockheed, Boeing, and Northrop submit designs for a fighter that meets the actual service requirements. These proposals include performance goals, production plans, and cost estimates.
 

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4. Prototype Phase
The service typically chooses two designs to move forward to a competitive prototype phase. These mission-specific prototypes are full aircraft built to the real specifications, not just tech demonstrators. They integrate the sensors, weapons bays, fuel load, landing gear, and cockpit layout the production aircraft will use.
 
This is what we saw with the YF-22 vs YF-23 in the 1990s and the X-35 vs X-32 in the 2000s.
 

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5. Competitive Fly-Off and Down-Select
The prototypes are flown and tested side by side. The service evaluates stealth, agility, maintenance, cost, and upgrade potential. One design is chosen as the official program of record.
 

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6. Engineering and Manufacturing Development (EMD)
The winning design is refined for production. Tooling is built, suppliers are locked in, and manufacturing processes are tested. This is where the B-21 program showed how to save time, digital engineering allowed production planning to happen in parallel with design refinement.
 

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7. Low-Rate Initial Production (LRIP)
A small batch of production-standard aircraft is built while testing continues. These jets are used for operational evaluation and to train the first units.
 

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8. Full-Rate Production and IOC
Once testing proves the aircraft meets all requirements, production ramps up. The first squadrons reach Initial Operational Capability (IOC) and can deploy for real missions.
 

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Why this matters for F-47 and F/A-XX
Even with NGAD’s demonstrator in the air, the Air Force (F-47) and Navy (F/A-XX) still have to build their own mission-specific prototypes, run competitive evaluations, and set up production lines.
 

Manufacturing Methodology
If they follow the old F-22 and F-35 timelines, we are looking at a decade or more before full-rate squadrons.
If they apply the B-21’s digital manufacturing methods, the F-47 could be ready by the late 2020s or early 2030s, with the F/A-XX only a few years behind.

[Signal Witch]

Manufacturing Methodology - Expanded Details

From now on, I think the Air Force and Navy are absolutely going to push for the much quicker B-21 style digital manufacturing approach going forward, especially for NGAD and its derivatives like the F-47 and F/A-XX.

Here’s why I lean that way:

• The B-21 proved it works. Northrop Grumman went from contract award to a physical, flyable bomber faster than any comparable stealth program since the 1980s. That was possible because of digital engineering, model-based design, and early supply chain integration.
  
• Congress is watching. Lawmakers have publicly praised the B-21 rollout for being on time and within budget. That’s the kind of result the services will want to repeat for a high-visibility, multi-billion-dollar fighter program.
  
• The cost pressure is real. The F-35’s drawn-out production ramp has become a warning story inside the Pentagon. Speeding up design-to-production reduces program risk and long-term cost.
  
• NGAD is tech-heavy but not “all-new tech” heavy. Much of what it will use; engines, sensor fusion, unmanned teaming, has been maturing for years in separate programs. That allows digital prototyping to pull those pieces together faster.
  
• Two-service leverage. If the Air Force and Navy share major subsystems between the F-47 and F/A-XX, they can align their manufacturing pipelines in a way that wasn’t possible in the past.
  

That said, there’s still a reality check. Even with digital manufacturing, they can’t skip:

• Building mission-specific prototypes for each service.
  
• Running competitive evaluations before a down-select.
  
• Clearing congressional funding gates.
  

If they fully lean into the B-21 playbook, I think we could see F-47 operational squadrons by 2029–2031 and F/A-XX by around 2033, instead of mid- or late-2030s.

[Zaphod58]

One of the biggest things to hurt the F-35 in recent years was the years long delay to Milestone C. Until they declared that, and began full rate production they couldn’t stand up supply lines and full Depots. That pushed the existing Depots to already be years behind, because they were having to order parts as needed, and with the supply line disruptions in the last few years, it’s really hurt them. 

Our acquisition process isn’t as broken as other countries, but it’s broken. The Raider has done amazing at showing what can be done when competent, goal minded people are put in charge. We need to keep that going for the F-47 and F/A-XX. We can’t afford another program that goes almost twenty years before declaring full rate production.