Air Force Expects Next-Generation Airlifter in Service by Early 2040s

But the C-17 and C-5 will need to remain viable for decades.

Zach Vasile

Monday, December 01, 2025 at 12:10 PM ET

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Edited By:

Ryan Ewing

Staff Sergeant John Eller conducts preflight checks on a C-17 Globemaster III. [Credit: U.S. Air Force]

Key Takeaways:

The U.S. Air Force plans to introduce its Next Generation Airlift (NGAL) transport aircraft by fiscal year 2041 to eventually replace the C-17 and C-5 fleets.
To mitigate risks during the NGAL's development, the Air Force will extend the service life of the current C-5 fleet until at least 2045 and the C-17 fleet until 2075.
The NGAL will first replace the C-5 fleet and then the C-17 fleet, with future designs prioritizing speed, agility, and performance in heightened threat environments.

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The U.S. Air Force says it could have a next-generation military transport aircraft in service as soon as fiscal year 2041, but it still wants its two main workhorses, the Boeing C-17 Globemaster III and the Lockheed C-5 Galaxy, up and running for decades to come.

If the acquisition process moves smoothly with no breaks in funding, the planned new aircraft, known by the military as the Next Generation Airlift (NGAL), could be in production by fiscal year 2038, with initial operational capability reached about three years later, according to a recent Air Mobility Command (AMC) memo. As the NGAL is phased in, however, the C-17 and the C-5 will have to continue flying missions.