Frontier Airlines briefly issued a nationwide ground stop due to IT issues.
The Federal Aviation Administration (FAA) announced the advisory on its website.
"Frontier Airlines has issued a nationwide ground stop following a major IT failure. Passengers are advised to check for updates as the airline works to resolve the issue," Mario Nawfal wrote.
The ground stop was requested by the Denver-based airline at 2233 GMT, and the stop was canceled at 2254 GMT, according to the FAA.
Frontier confirmed that the ground stop had been lifted, and said its systems operations center experienced a short internet outage that caused the airline to initiate a brief ground stop.
"Frontier Airlines has resolved its computer issues, and the nationwide ground stop has been lifted. Passengers should still expect delays as operations return to normal," Nawfal noted.