Some American Airlines passengers faced lengthy flight delays on Tuesday after a fault in the iPad navigation app used by the carriers’ pilots and co-pilots caused the tablets to crash.

“Some flights are experiencing an issue with a software application on iPads,” American Airlines said on Twitter to a passenger whose flight was delayed.

The glitch appeared to impact the airline’s fleet of Boeing 737 aircraft and occurred suddenly.

“Pilot says *all* #AmericanAirlines pilot iPads in 737 fleet went dead, all at once,” passenger Stephen Edmonds wrote on Twitter.

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