The carrier failed to perform maintenance on the aircrafts, which resulted in the cancellation of 25 flights.

United admitted to the FAA that it didn't have to maintain the wing leading-edge panel on the planes.

"We are working with the FAA to return others to service while we conduct additional checks on 10 of the aircraft," United said.

The circumstances that led to the missed inspections are being looked into by the FAA.

There have been issues with the plane going back to last year. United grounded all of its Boeing 777 airplanes in February of 2021. An emergency landing was made by a United flight from Denver to Honolulu after pieces of an engine fell from the sky.

The FAA cleared all 52 planes to fly again in May of this year.

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