Pentagon’s F-35 Expansion Plan Depends Heavily on a Separate Funding Fight

Congress is the real near-term gatekeeper

The political risk is explicit. House Speaker Mike Johnson has acknowledged that a second reconciliation bill could be difficult to pass, and some House Republicans have already pushed back on the idea after the passage of the One Big Beautiful Bill Act last year. Because the supplemental mandatory funding bill has not even been introduced yet, the majority of the F-35 request currently rests on a mechanism that is not guaranteed to materialize.

For defense planners and industry alike, that creates uncertainty. Procurement plans influence supplier commitments, workforce expectations and production pacing. A request for 85 aircraft sends one signal to the industrial base. A final appropriation for 32 would send another. The gap between those outcomes is large enough to affect planning across the program.

The budget also tries to address longstanding program issues

The fiscal 2027 request is not only about buying more jets. It also includes money intended to accelerate upgrades and improve readiness. One budget line of $324 million in the mandatory funding request would speed procurement of 200 Block 4 modification kits, pulling the first fleet delivery forward from fiscal 2031 to fiscal 2030.

That is notable because Block 4 has become one of the program’s central problem areas. The upgrade package is supposed to add sensors, electronic warfare capability and weapons integration, but the schedule has slipped by roughly five years from its original timeline. Much of that delay has been tied to problems with the Technology Refresh 3 processor, the computing hardware needed to support the newer software baseline.

The budget therefore attempts to show that additional money would not simply buy more airframes. It would also address capability and modernization bottlenecks that have reduced confidence in the program’s pace.

Readiness remains a core weakness

The request further targets the F-35’s readiness shortfalls. The fleet averaged about a 50% mission-capable rate in fiscal 2024, according to the source text. That means fewer than half the aircraft were ready for combat at any given time, well below the program’s 65% availability target. Acting Pentagon Comptroller Jules Hurst said last week that the aircraft had been underfunded in prior budgets and that the fiscal 2027 structure is meant to raise that rate.

This is a critical point. Procurement totals can dominate headlines, but combat usefulness depends on how many aircraft can actually fly when needed. If sustainment, spare parts, maintenance cycles and upgrade timelines lag, larger fleet numbers alone do not fully solve the military problem. The Pentagon is effectively arguing that the new budget should be understood as a combined procurement and readiness repair package.

What it means for the services

The Air Force would receive the largest share of the planned buy with 38 F-35As, 14 more than the 24 funded in fiscal 2026. When combined with the 24 F-15EX fighters sought in the same request, the service’s total fighter buy would reach 62 aircraft. Even that figure, however, remains 10 short of the 72-aircraft annual minimum that National Guard generals told Congress this month is necessary for sustained force structure health.

That context matters because it shows the budget is trying to recover lost momentum without fully closing every capacity gap. The Navy and Marine Corps components of the F-35 request also reinforce the aircraft’s role across carrier aviation and expeditionary operations, but the credibility of the entire package depends on Congress accepting the administration’s more complicated financing plan.

The bottom line

The fiscal 2027 F-35 request is both ambitious and precarious. It promises a major expansion in procurement, faster Block 4 modifications and an effort to improve a fleet that is still falling short on mission-capable rates. But most of the increase is not secured inside the regular budget. It hinges on a second reconciliation bill that may prove politically difficult.

That leaves the program in a familiar position: strategically central, operationally necessary and still vulnerable to budget mechanics and execution risk. The Pentagon has drawn the outline of a larger F-35 recovery plan. Congress will decide whether that outline becomes a real procurement surge or another example of aspirations outrunning appropriations.

This article is based on reporting by Defense News. Read the original article.