American Airlines has resumed flights after suspending its services for around an hour on Tuesday due to a technical issue that impacted the systems needed to release its planes.
The disruption came during one of the busiest travel days of the year as passengers made journeys on Christmas Eve.
In a statement, the airline said a "vendor technology issue" had caused the problem and it was "all hands on deck" to minimise further disruption.
Departure boards at major US airports are still showing delays of up to two hours for some flights as the airline recovers from the nationwide issue, but real-time tracking website Flightradar24 shows planes taking off again at a number of major US travel hubs and most flights are departing on time.
Passengers reported on social media being stuck on the tarmac or at gates, while others were told to disembark from their planes.
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