The affected F-35s could be back in the air in one to two weeks.
Lockheed Martin also previewed its plans for updating existing fighters with the hardware and software upgrades known as Technology Refresh 3.
Pratt & Whitney's deliveries of F135 engines are on hold while the U.S. military and contractors try to find the root cause of a Dec. 15 F-35 mishap.
Firefighters at Whiteman Air Force Base in Missouri extinguished a fire at the scene.
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