F110
FieldedEngine
Two F110-GE-129 engines powered the first F-15EX. A competing F100 proposal is not an installed-component claim.
Link Confirmed
Aircraft · Air
F-15EX Eagle II
Modernized F-15 fighter with digital flight controls and upgraded avionics.
by Boeing · Unveiled Mar 12, 2019
Limited fieldingAircraftAirMilestoneJul 12, 2025
boeing.com/defense/fighters-and-bombers/f-15ex-eagle- Milestones8
- Operators—
- Components1
- Programs—
- Capabilities—
- Inputs—
Milestones20192025
Timeline8
- UnveiledReported
F-15EX named in Air Force FY2020 budget request
The F-15EX designation first appeared publicly in the Air Force's FY2020 budget request, briefed to reporters on March 12, 2019, which sought eight F-15EX aircraft. Earlier coverage used the informal, unconfirmed label F-15X for Boeing's pitch.
- Contract awardConfirmed
Air Force awards first F-15EX production lot
The nearly $1.2 billion Boeing contract covered the first eight F-15EX aircraft and associated development and support work.
- First flightConfirmed
First F-15EX flight
- First deliveryConfirmed
U.S. Air Force accepts first F-15EX
- MilestoneConfirmed
F-15EX fires its first live missile
A 40th Flight Test Squadron F-15EX fired an AIM-120D during Combat Archer. This was a weapons trial, not combat use or the first ground test of the aircraft.
- MilestoneConfirmed
First F-15EX reaches an operational unit in Oregon
The 142nd Wing received its first F-15EX at Portland Air National Guard Base. Earlier aircraft had been delivered for testing; this milestone does not assert a separate IOC declaration.
- MilestoneConfirmed
GAO assessment: F-15EX production and delivery risks
GAO’s June 2025 assessment reports full-rate production in June 2024 and initial operational capability in July 2024. The September 2024 cost estimate covered 98 aircraft (96 procurement and two development). GAO identified production-rate, parts-supply and cybersecurity risks. These are historical findings, not a current fleet count.
- MilestoneConfirmed
F-15EX test aircraft deploy to Kadena for training
Two 85th Test and Evaluation Squadron aircraft arrived for integration and familiarization training. This temporary visit is distinct from permanent basing plans.
The latest 10 milestones. Solid entries are confirmed, outlined reported, dashed estimated or still to come; dotted italic entries are speculative. Dates show only the precision the sources give.
Cost to the Government
Aircraft · Boeing
F-15EX Eagle II
Current-production fighter with budget exhibits that separately identify recurring aircraft cost, weapon-system cost and future procurement quantities.
FY2027 flyaway unit estimate
$101.495M
FY2027 budget request · Then-year USD
P-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs.
U.S. Air Force ↗Cumulative deliveries reported
16
Late 2025; reported 2026-01 · U.S. only
Report describes delivery through EX16; not a 2026 mission-capable fleet count.
U.S. Air Force ↗Planned acquisition program
268
FY2027 budget request · U.S. only
Budget narrative includes 8 Lot 1 aircraft and 21 mandatory-funded aircraft outside the 239-aircraft table total. Procurement plans are not inventory.
U.S. Air Force ↗R&D program total
Not verified
A separately identified lifetime development total has not been verified. This is not a zero-cost estimate.
Cost & funding breakdown
FY2027 gross weapon-system unit cost
$110.697M
FY2027 request · Then-year USD
Includes support identified in the P-40 exhibit.
U.S. Air Force ↗FY2027 procurement request
$2.657B
FY2027 request · Then-year USD
Total request for 24 aircraft; not an awarded contract.
U.S. Air Force ↗FY2027 requested aircraft
24
FY2027 request · U.S. only
Budget request, not deliveries.
U.S. Air Force ↗Why the first award is not the recurring unit price
The initial award bundled development and support with eight aircraft. The later budget’s flyaway line is a narrower production measure; gross weapon-system cost adds the support identified in that exhibit.
Operations & sustainment
Reimbursement / flight hour
$17,321 / hr
FY2026 · Nominal USD; Other DoD Component
Published billing rate for use by another DoD component. It is not the fully burdened cost of ownership.
DoD Comptroller ↗Cost over time · 3 observations
Each row retains its original scope and dollar basis. Changing quantities, service life and inflation can change the estimate without changing the price of building one unit.
| Observation | Measure | Amount | Dollar basis | Evidence |
|---|---|---|---|---|
| FY2025 | Flyaway unit cost Same P-40 series; fiscal-year lot mix changes. | $103.029M | Then-year USD | U.S. Air Force ↗ |
| FY2026 | Flyaway unit cost Discretionary one-aircraft line in the P-40 exhibit. Twenty-one mandatory-funded aircraft are outside this unit average. | $115M | Then-year USD | U.S. Air Force ↗ |
| FY2027 budget request | FY2027 flyaway unit estimate P-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs. | $101.495M | Then-year USD | U.S. Air Force ↗ |
Contracts & purchasing · 1 records
Award values, ceilings and purchase agreements have different meanings. These records are not added together as total spending.
2020-07-13 · Initial lot; approximately
U.S. Air Force → Boeing
$1.2B · 8 units in scope
Includes development, integration, testing, support and eight aircraft; division by eight would not produce a recurring flyaway price.
U.S. Air Force ↗
International buyers
No international purchase documented in this review.
Coverage & open research
- Figures retain the date and scope of the original source. A historical count, cumulative delivery or procurement plan is not today’s mission-capable inventory.
- A separately identified lifetime development total has not been verified. This is not a zero-cost estimate.
- Total acquisition costEstimated$12.29BEstimate / observation: 2024-09 · BY2025 $ · 98 units
GAO-25-107569 printed p. 72 (PDF p. 82); estimate dated 2024-09, expressed in constant FY2025 dollars. Visually transcribed from the program performance graphic, whose amounts are in millions. Historical estimate, not a current price or contract award. Total covers development and procurement quantities.
Source - Unit cost (PAUC)Estimated$125MEstimate / observation: 2024-09 · BY2025 $
GAO-25-107569 printed p. 72 (PDF p. 82); estimate dated 2024-09, expressed in constant FY2025 dollars. Visually transcribed from the program performance graphic, whose amounts are in millions. Historical estimate, not a current price or contract award. Program acquisition unit cost (PAUC); GAO methodology p. 197 divides program cost by total quantities. Report-rounded value, not flyaway or procurement unit price.
Source - Unit cost (flyaway)Reported$90.0MEstimate / observation: 2023-09-28 · Then-year $ · 12 units
Air Force spokesperson via Breaking Defense: flyaway price in the Lots 2-4 contract finalized Sept. 28, 2023 is approximately $90M per aircraft for Lot 2 (12 jets), rising to $97M for Lot 3 (12 jets) and $94M for Lot 4 (24 jets); cumulative value of the three lots $3.9B for 48 aircraft. Flyaway includes airframe, EPAWSS, engines, radars and other subsystems plus production NRE, SE/PM and ECOs; then-year dollars. Lots 3/4 prices kept in notes only (same natural key).
Source - Unit cost (APUC)Reported$94.0MEstimate / observation: 2022-12 · Then-year $ · 104 units
Average procurement unit cost from the F-15EX annual Selected Acquisition Report (based largely on CY2022 data, updated for the FY2024 plan of 104 aircraft), as reported by Air & Space Forces Magazine; includes EPAWSS; then-year dollars. Previous APUC with the smaller buy was $114.2M.
Source - Contract unit priceReported$108MEstimate / observation: 2026-09-29 · Then-year $ · 22 units
Lot 7 contract awarded Sept. 29, 2026: $2.38B for 22 F-15EX; average $108M per aircraft as computed by Air & Space Forces Magazine. Excludes GE F110 engines (bought separately as GFE). Funded from FY2026 budget and 2025 reconciliation.
Source
Earlier cost observations (3)
- F-15EX Eagle II · Total acquisition cost · $12.47BEstimate / observation: 2022-12 · Then-year $ · 104 units
Then-year program acquisition cost (development, procurement, MILCON) from the same SAR (104-aircraft program), as reported by Air & Space Forces Magazine.
Source - F-15EX Eagle II · Unit cost (flyaway) · $80.5MEstimate / observation: 2022-11 · Then-year $ · 6 units
Lot 1 definitized November 2022: flyaway price $80.5M per jet for six jets (two test aircraft bought earlier). Then-year dollars per Air Force practice.
Source - F-15EX Eagle II · Unit cost (flyaway) · $87.7MEstimate / observation: 2020-07
Per-unit flyaway cost in the July 2020 initial F-15EX contract as reported by Air Force Magazine, including engines; cited by Forbes. Boeing had claimed Block 1 flyaway under $80M.
Source
| Fiscal year | Appropriation | Request | Enacted | Qty | Budget line | Source |
|---|---|---|---|---|---|---|
| FY2027 | RDT&E | $133M | — | — | — | SourceConfirmed |
| FY2027 | Procurement | $2.96B | — | 24 | — | SourceConfirmed |
| FY2027 | Total | $3.10B | — | 24 | — | SourceConfirmed |
| FY2026 | RDT&E | $80.4M | $158M | — | — | SourceConfirmed |
| FY2026 | Procurement | $3.02B | $3.17B | 22 | — | SourceConfirmed |
| FY2026 | Total | $3.10B | $3.33B | 22 | — | SourceConfirmed |
| FY2025 | RDT&E | — | $56.2M | — | — | SourceConfirmed |
| FY2025 | Procurement | — | $1.85B | 18 | — | SourceConfirmed |
| FY2025 | Total | — | $1.90B | 18 | — | SourceConfirmed |
Unit costs and contract unit prices for this system, and budget figures for the programs that buy it. Each figure states its dollar basis and links its source; contract values are under Programs & awards.