Following an outage that grounded all American airlines flights during one of the busiest travel periods of the year, American Airlines says it has resumed service Tuesday morning.

The Federal Aviation Administration has ordered all American Airlines flights grounded in the U.S. after the carrier reported a technical issue affecting its entire system with millions traveling for the holiday.

American Airlines cancels nationwide ground stop after suffering “technical issues” on one of the busiest travel days of the yearAmerican Airlines has lifted its nationwide ground stop for its flights after the airline was hit with major technical issues.