American Airlines has stopped flights heading to Dallas, Chicago and Miami because of a computer-systems problem.
Airline spokesman Casey Norton said Thursday that the outage began around 11 a.m. CDT.
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Norton says the airline doesn't know the cause of the problem but is working to fix it.
The Federal Aviation Administration says American planes destined for Dallas-Fort Worth International Airport, O'Hare Airport in Chicago and Miami International Airport are being held on the ground.