On Tuesday morning, the Pentagon announced a “limited return to flight” for the F-35s, but officials later said the F-35 would not make the trip across the Atlantic for the airshow.

While the fighters are returning to the skies, albeit in a limited capacity, the plane’s problems nonetheless continue to raise concerns that at least some of the United States’ eight international partners on the program may rethink their commitment to the F-35 and make it difficult to attract additional partners. The program’s troubled past has made the F-35, the most expensive program in Pentagon history, a lightning rod for criticism both in the United States and overseas.

But Defense officials and key lawmakers continue to stand by the advanced stealth fighter, which will replace older fighters in the Air Force, Navy and Marine Corps fleet.