DFW Airport ranked No. 1 on FlightAware's MiseryMap on Wednesday afternoon with the most cancellations and delays in the U.S.

Just before 6 a.m., the Federal Aviation Administration had ordered all American Airlines flights grounded in the U.S. at the airline’s request.

The Federal Aviation Administration called a ground stop at DFW International Airport on the morning of Christmas Eve due to weather and

The FAA issued a ground stop for most planes flying to DFW, on top of delays caused by an American Airlines software issue.

The lingering effects of American Airlines’ technical issues on Tuesday morning, combined with storms in North Texas, are causing major travel headaches for people this Christmas Eve.

Passengers told NewsNation that they experienced delays of between 30 to 90 minutes due to the nationwide outage. Most flights were running on time by Tuesday afternoon. The outage also affected American Airlines pilots, who told NewsNation that the technology glitch kept them from accurately reading fuel levels.

The FAA issued a ground stop for most planes flying to DFW, adding to delays caused by an American Airlines software issue.