F110
GE fighter engine family used by F-16 and advanced F-15 aircraft.
Fielded
- Fielded
- Oct 1986
Photo: U.S. Air Force photo by Alex R. Lloyd · Public domain (PD-USGov-Military-Air Force)
Program · United States · U.S. Air Force
F-15EX Eagle II
Modernized F-15 fighter with digital flight controls and upgraded avionics.
Updated
ProductionU.S. Air Force
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.
Program and variant milestones. Dates show only the precision the sources give.
Cost to the Government$12.29B total acquisition
| Measure | Amount | Source |
|---|---|---|
| Program totals · 4 | ||
| Total acquisition costGAO-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. | $12.287BBY2025 $ · 98 units | Weapon Systems Annual Assessment: DOD Leaders Should Ensure That Newer Programs Are Structured for Speed and Innovation — p. 72 U.S. Government Accountability Office · Jun 11, 2025 · figure Sep 2024 |
| Total acquisition costThen-year program acquisition cost (development, procurement, MILCON) from the same SAR (104-aircraft program), as reported by Air & Space Forces Magazine. | $12.47BThen-year $ · 104 units | New Acquisition Report: F-15EX Unit Cost Will Be $94 Million Air & Space Forces Magazine · Oct 4, 2023 · figure Dec 2022 |
| FY2027 procurement requestTotal request for 24 aircraft; not an awarded contract. | $2.657BThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request |
| R&D program totalA separately identified lifetime development total has not been verified. This is not a zero-cost estimate. | Not established | — |
| Unit costs · 7 | ||
| Contract unit priceLot 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. | $108MThen-year $ · 22 units | Air Force Inks Deal for 22 More Boeing F-15EX Fighters Air & Space Forces Magazine · Sep 30, 2026 · figure Sep 29, 2026 |
| Unit cost (PAUC)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. | $125.4MBY2025 $ | Weapon Systems Annual Assessment: DOD Leaders Should Ensure That Newer Programs Are Structured for Speed and Innovation — p. 72 U.S. Government Accountability Office · Jun 11, 2025 · figure Sep 2024 |
| Unit cost (flyaway)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. | $87.7MBasis not stated | How Much Does An F-15EX Cost? Boeing And The Air Force Don't Agree. Forbes · Jul 24, 2020 · figure Jul 2020 |
| Unit cost (flyaway)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). | $90MThen-year $ · 12 units | Newest F-35, F-15EX contracts are set. Here's how much they cost. (EXCLUSIVE) Breaking Defense · Oct 26, 2023 · figure Sep 28, 2023 |
| Unit cost (APUC)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. | $93.95MThen-year $ · 104 units | New Acquisition Report: F-15EX Unit Cost Will Be $94 Million Air & Space Forces Magazine · Oct 4, 2023 · figure Dec 2022 |
| FY2027 flyaway unit estimateP-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs. | $101.495MThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request |
| FY2027 gross weapon-system unit costIncludes support identified in the P-40 exhibit. | $110.697MThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request |
| Quantities · 3 | ||
| Cumulative deliveries reportedReport describes delivery through EX16; not a 2026 mission-capable fleet count. | 16U.S. only | F-15EX production rebounds, deliveries continue, January 2026 U.S. Air Force · figure Late 2025; reported Jan 2026 |
| Planned acquisition programBudget narrative includes 8 Lot 1 aircraft and 21 mandatory-funded aircraft outside the 239-aircraft table total. Procurement plans are not inventory. | 268U.S. only | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request |
| FY2027 requested aircraftBudget request, not deliveries. | 24U.S. only | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request |
| Operating costs · 1 | ||
| Reimbursement / flight hourPublished billing rate for use by another DoD component. It is not the fully burdened cost of ownership. | $17,321 / hrNominal $; Other DoD Component | FY2026 aircraft hourly reimbursement rates, Other DoD Component column DoD Comptroller · figure FY2026 |
Program totals · 4
- Total acquisition costGAO-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.Weapon Systems Annual Assessment: DOD Leaders Should Ensure That Newer Programs Are Structured for Speed and Innovation — p. 72 U.S. Government Accountability Office · Jun 11, 2025 · figure Sep 2024$12.287BBY2025 $ · 98 units
- Total acquisition costThen-year program acquisition cost (development, procurement, MILCON) from the same SAR (104-aircraft program), as reported by Air & Space Forces Magazine.New Acquisition Report: F-15EX Unit Cost Will Be $94 Million Air & Space Forces Magazine · Oct 4, 2023 · figure Dec 2022$12.47BThen-year $ · 104 units
- FY2027 procurement requestTotal request for 24 aircraft; not an awarded contract.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request$2.657BThen-year $
- R&D program totalA separately identified lifetime development total has not been verified. This is not a zero-cost estimate.Source not recordedNot established
Unit costs · 7
- Contract unit priceLot 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.Air Force Inks Deal for 22 More Boeing F-15EX Fighters Air & Space Forces Magazine · Sep 30, 2026 · figure Sep 29, 2026$108MThen-year $ · 22 units
- Unit cost (PAUC)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.Weapon Systems Annual Assessment: DOD Leaders Should Ensure That Newer Programs Are Structured for Speed and Innovation — p. 72 U.S. Government Accountability Office · Jun 11, 2025 · figure Sep 2024$125.4MBY2025 $
- Unit cost (flyaway)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.How Much Does An F-15EX Cost? Boeing And The Air Force Don't Agree. Forbes · Jul 24, 2020 · figure Jul 2020$87.7MBasis not stated
- Unit cost (flyaway)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).Newest F-35, F-15EX contracts are set. Here's how much they cost. (EXCLUSIVE) Breaking Defense · Oct 26, 2023 · figure Sep 28, 2023$90MThen-year $ · 12 units
- Unit cost (APUC)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.New Acquisition Report: F-15EX Unit Cost Will Be $94 Million Air & Space Forces Magazine · Oct 4, 2023 · figure Dec 2022$93.95MThen-year $ · 104 units
- FY2027 flyaway unit estimateP-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request$101.495MThen-year $
- FY2027 gross weapon-system unit costIncludes support identified in the P-40 exhibit.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request$110.697MThen-year $
Quantities · 3
- Cumulative deliveries reportedReport describes delivery through EX16; not a 2026 mission-capable fleet count.F-15EX production rebounds, deliveries continue, January 2026 U.S. Air Force · figure Late 2025; reported Jan 202616U.S. only
- Planned acquisition programBudget narrative includes 8 Lot 1 aircraft and 21 mandatory-funded aircraft outside the 239-aircraft table total. Procurement plans are not inventory.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request268U.S. only
- FY2027 requested aircraftBudget request, not deliveries.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 request24U.S. only
Operating costs · 1
- Reimbursement / flight hourPublished billing rate for use by another DoD component. It is not the fully burdened cost of ownership.FY2026 aircraft hourly reimbursement rates, Other DoD Component column DoD Comptroller · figure FY2026$17,321 / hrNominal $; Other DoD Component
Earlier observations · 4
Superseded estimates and prices, each in its original scope and dollar basis.
| Measure | Amount | Source |
|---|---|---|
| Unit cost (flyaway)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. | $80.5MThen-year $ · 6 units | Newest F-35, F-15EX contracts are set. Here's how much they cost. (EXCLUSIVE) Breaking Defense · Oct 26, 2023 · figure Nov 2022 |
| FY2027 flyaway unit estimateP-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs. | $101.495MThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request |
| Flyaway unit costSame P-40 series; fiscal-year lot mix changes. | $103.029MThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2025 |
| Flyaway unit costDiscretionary one-aircraft line in the P-40 exhibit. Twenty-one mandatory-funded aircraft are outside this unit average. | $115MThen-year $ | FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2026 |
- Unit cost (flyaway)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.Newest F-35, F-15EX contracts are set. Here's how much they cost. (EXCLUSIVE) Breaking Defense · Oct 26, 2023 · figure Nov 2022$80.5MThen-year $ · 6 units
- FY2027 flyaway unit estimateP-40 F-15EX exhibit; request for 24 aircraft. Excludes separately identified support costs.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2027 budget request$101.495MThen-year $
- Flyaway unit costSame P-40 series; fiscal-year lot mix changes.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2025$103.029MThen-year $
- Flyaway unit costDiscretionary one-aircraft line in the P-40 exhibit. Twenty-one mandatory-funded aircraft are outside this unit average.FY2027 Aircraft Procurement, Volume I, April 2026, P-40 exhibits U.S. Air Force · figure FY2026$115MThen-year $
| Fiscal year | Appropriation | Request | Enacted | Qty | Budget line | Source |
|---|---|---|---|---|---|---|
| FY2027 | RDT&E | $133M | — | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2027 | Procurement | $2.96B | — | 24 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2027 | Total | $3.10B | — | 24 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2026 | RDT&E | $80.4M | $158M | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2026 | Procurement | $3.02B | $3.17B | 22 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2026 | Total | $3.10B | $3.33B | 22 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2027 Budget Request Office of the Under Secretary of War (Comptroller) · Apr 21, 2026 |
| FY2025 | RDT&E | — | $56.2M | — | — | Program Acquisition Cost by Weapon System: Fiscal Year 2026 Budget Request Office of the Under Secretary of War (Comptroller) |
| FY2025 | Procurement | — | $1.85B | 18 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2026 Budget Request Office of the Under Secretary of War (Comptroller) |
| FY2025 | Total | — | $1.90B | 18 | — | Program Acquisition Cost by Weapon System: Fiscal Year 2026 Budget Request Office of the Under Secretary of War (Comptroller) |
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.
First lot of eight F-15EX aircraft, July 13, 2020 U.S. Air Force
Contracts & purchasing · 1
Ceilings, options and purchase agreements are not spending and are never added together. Obligations are under Contracts.
| Buyer → seller | Status | Value | Qty | Source |
|---|---|---|---|---|
| U.S. Air Force → BoeingIncludes development, integration, testing, support and eight aircraft; division by eight would not produce a recurring flyaway price. | Initial lot; approximately | $1.2B | 8 | First lot of eight F-15EX aircraft, July 13, 2020 U.S. Air Force · figure Jul 13, 2020 |
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.
What the government budgets and pays for this program, from budget justification books, appropriations, acquisition reports and contract announcements. Each figure states its dollar basis. What contractors were obligated is under Contracts.
Supply Chain1
Major components and the companies that make them.