Technical issues hampered the airline’s operations on one of the busiest travel days of the year. Holiday travelers flying with American Airlines experienced widespread Christmas Eve disruptions on Tuesday after the Federal Aviation Administration (FAA) announced that the airline had grounded all of its flights nationwide.

American Airlines said on Tuesday its flights had resumed after a technical glitch forced the carrier to issue an hour-long ground stop, disrupting travel for thousands on Christmas Eve, one of the busiest periods of the year.

The FAA issued a nationwide ground stop for all American Airlines flights on Christmas Eve due to a “technical issue.”