Chaos on the Ground When 70 American Airlines Flights are Delayed

Computer glitch in an app that pilots rely on caused their iPads to malfunction.
1:28 | 04/29/15

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Transcript for Chaos on the Ground When 70 American Airlines Flights are Delayed
Now, to the chaos on the ground tonight. More than 70 flights delayed because of a computer glitch when an glitch on the iPad their pilots rely on went down. ABC's David Kerley tonight on how this even happens. Reporter: Those 70-plus delays so far tonight, all because an app on the pilots' iPads didn't work. The app that provides pilots airport landing maps malfunctioned and passengers were stuck. One tweeting, "Pilot just told us iPad is broke. #Seriously?" Some pilots had to return to the gate area for wifi to download the app again. Obviously the iPad is very light compared to 40 pounds of kit bag. Reporter: American was an early adoper the of tablets in the cockpit. Pilots able to leave behind those 40-pound cases filled with paper maps. And iPad use has exploded in the past four years. The map company estimates 10,000 iPads are in jets tonight. And there have been few problems. I'm astounded that it's been as smooth as it has been. This is one of the first times I've ever heard of this sort of thing happening, and you would have expected it a lot more. Reporter: Turns out American airlines has a unique version of the app, and an automatic update last night inserted two maps of the same airport which made the app crash. Those two maps were of this airport, Reagan in Washington. So, any American pilot flying into this airport will have to use the backup system, a paper map, until their iPad app is updated in about ten days. David? All right, David Kerley. David, thank you. One more headline involving

This transcript has been automatically generated and may not be 100% accurate.

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