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United Airlines issued a nationwide ground stop on all flights that was quickly lifted, the Federal Aviation Administration has confirmed.
In a statement, the airline said that all departures were halted due to a "systemwide technology issue".
Flights already in the air are continuing to their destination as planned, the airline said.
United said more details will be released later on Tuesday.
The ground stop was lifted shortly before 1400 EST (1900 BST).
The BBC has reached out to the airline and FAA for comment.
Data from flight tracking website FlightAware shows that seven United flights have so far been cancelled.
Another 211 have been delayed, according to the website.