Grounded American Airlines flights resuming after technical problems

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American Airlines tells CNN in an email that they are aware of technical issues that are impacting their operations at various airports in the US, including Dallas/Fort Worth International Airport and Chicago's O'Hare International Airport

NEW YORK —  American Airlines was preparing to resume flights Thursday after computer problems briefly grounded flights at three of its busiest airports.

The problem affected flights to and from Chicago’s O’Hare Airport, as well as Dallas-Fort Worth and Miami. It started around 12:41 p.m. ET, according to the FAA. By 2:42 p.m. American said its “connectivity issues” had been resolved.

“We apologize for the inconvenience and are working to get our customers on their way as soon as possible,” an American spokesman told CNN.

Problems with computer systems grounding flights are not uncommon.

United Airlines suffered a grounding in March that lasted less than an hour.

But these kinds of technical problems have a way of rippling through an airline’s schedule, causing problems that can take hours or even days to resolve fully, particularly when it hits three major hubs like O’Hare, DFW and Miami.

Airline schedules are very tight, which makes restoring normal operations and rebooking affected passenger costly and time consuming, said James Record, a professor of aviation at Dowling College, at the time of the United glitch.

Even flights that were able to land as planned at affected airports can be delayed if there isn’t a gate available to unload passengers. That can cause many passengers to miss connections.

American had to ground about 75 flights over two days this past April due to problems with an iPad app used by pilots. American pilots now get their flight plans and other technical information over company-issued Apple iPads.