EDWARDS AIR FORCE BASE, California—With deliveries of new F-35s on hold while bugs are worked out of a planned upgrade, the plane’s lead test squadron is doing its part to spot problems where the new ...

House lawmakers have approved an amendment to the proposed fiscal 2025 National Defense Authorization Act that would increase the number of F-35 Joint Strike Fighters dedicated as developmental test ...

The Lightning II that crashed on Tuesday was one of very few F-35 developmental test aircraft, exacerbating a shortage that has in the past led to program delays. The aircraft, which was en route from ...