Omaha, NE (AP) — Federal authorities are investigating reports that an intoxicated pilot was prevented from boarding a flight in Omaha.

FAA spokeswoman Elizabeth Isham Cory says Frontier Airlines had reported Thursday’s incident to the FAA, as required.

Frontier says its Flight 1894 to Milwaukee was scheduled to leave Omaha’s Eppley Airfield at 6 a.m. but was delayed for nearly two hours. The flight carried 29 passengers and three crew members, including two pilots.

The passengers waited in the terminal during the delay.

Frontier declined to make any other comments about the pilot or the incident. Cory says the pilot’s certificate includes a medical as well as proficiency portion.