American Airlines Flights Back Up After Being Grounded

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American Airlines flights at Northwest Arkansas Regional Airport and across the country are back up after a "system-wide ground delay" grounded flights Tuesday, according to the airline.American Airlines reported a problem with its reservation and booking tool, noting the network was experiencing "intermittent outages."

Northwest Arkansas Regional Airport started issuing American Airlines passengers boarding passes at about 3:30 p.m. and told them the system was fixed and flights were back on schedule.

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

Information from CNN was used in this report.