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.”

All American Airlines flights nationwide were halted Tuesday morning. Why it matters: The nationwide outage threatens to snarl traffic on Christmas Eve for the world's largest carrier. Catch up quick: Bloomberg reported the airline may be experiencing a software issue.