American Airlines Grounds Flights Until 5 p.m. - KiiiTV.com South Texas, Corpus Christi, Coastal Bend

American Airlines Grounds Flights Until 5 p.m.

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(CNN) - American Airlines has instituted a "system-wide ground delay" until 5 p.m. ET, the airline tweeted Tuesday.

Earlier, the airline reported a problem with its reservation and booking tool, noting the network was experiencing "intermittent outages."

American estimates it flies about 275,000 passengers a day and receives more than 239,000 reservations calls.