Pentagon Report Details Cost and Schedule Risks in Expanded F-15EX Order

The U.S. Air Force's decision to expand its F-15EX Eagle II procurement from 129 to 267 aircraft introduces new supply chain and obsolescence risks, according to a Pentagon selected acquisition report released in August 2026. The expansion, driven by a strategy to recapitalize the aging F-15E Strike Eagle fleet rather than let it age out, stretches the production line years further into the future.[1][3]

The revised acquisition strategy extends the program from eight production lots to 12. The Pentagon report warns that this longer timeline means key systems—including the radar, mission computer, electronic warfare suite, and General Electric F110 engines—could face diminishing manufacturing sources before the final aircraft is built, requiring a "significant redesign effort."[1][2]

To mitigate these obsolescence risks, program managers plan to integrate upgraded subsystems through scheduled operational flight program releases between 2031 and 2035. This approach is designed to allow testing and fielding to occur without halting the production line, assuming stable funding and supplier availability over the next eight years.[1][2]

However, near-term production is already facing what the acquisition report terms "unrecoverable delays." A labor strike at Boeing's St. Louis, Missouri, plant from August to November 2025 permanently shifted the delivery schedule. Boeing's contract required all 12 Lot 3 jets to be delivered in early calendar 2026, but the company is now projected to deliver only six by the end of the year.[1][3]

The delays cascade into subsequent production blocks. Lot 4 deliveries, originally slated to begin in 2026, are now not expected to start until calendar 2028. To meet its future delivery requirements, Boeing must double its current production rate to two F-15EX aircraft per month.[1][3]

This required ramp-up is complicated by acute parts shortages. The report identifies the most critical bottlenecks as the Elbit-built large area displays and low-profile head-up displays that comprise the aircraft's glass cockpit, General Electric F110 engines, and Collins-made cartridges for the ejection system.[1][3]

The schedule slips directly impact overseas deployments, particularly at Kadena Air Base in Okinawa, Japan. Kadena lost its permanently assigned F-15C and D Eagles when the Air Force began retiring them in November 2022, and the base has relied on a rotating cast of visiting fighter squadrons to maintain coverage since.[1][3]

The first Lot 3 F-15EXs destined for Kadena were originally expected to arrive in spring 2026. Due to the production delays, those aircraft are now not forecast to be fielded until at least the first quarter of fiscal 2027.[1][3]

Despite the broader schedule shifts, the first Kadena-bound F-15EX departed Boeing's St. Louis facility on August 28, 2026. The aircraft flew to the Oregon Air National Guard's 142nd Wing at Portland Air National Guard Base, which is serving as a coordination unit to handle final staging and integration preparations before the jet crosses the Pacific.[2]

"This is an important next step toward bringing the F-15EX home to Kadena," said Brig. Gen. John Gallemore, commander of the 18th Wing, in an Air Force release. "Our team is ready to welcome the F-15EX, and this is another milestone that brings us closer to putting this capability in the hands of the airmen who will fly, maintain and employ it from Japan."[2]

To manage the remaining backlog, the F-15EX program management office is working with the Defense Department's Business Operators for National Defense team. Their immediate focus is optimizing the final assembly schedule to prioritize the remaining Lot 3 jets earmarked for overseas assignments, while coordinating a bridging strategy to ensure older aircraft can cover operational requirements until the new fleet arrives.[3]