The Houston-bound flight, carrying 135 passengers, returned to the Colorado airport without incident. No injuries were reported.
Southwest said the plane “landed safely after experiencing a mechanical issue,” according to ABC News.
The Federal Aviation Administration announced on Sunday that it will investigate the incident on the Boeing 737-800, the latest involving the aircraft manufacturer.
A passenger, who gave the name Lisa C, told ABC News said the cowling detached approximately 10 minutes after boarding was completed.
“We all felt kind of a bump, a jolt, and I looked out the window because I love window seats, and there it was,” she told the outlet.
Another passenger, Cooper Glass, told ABC News that the incident was “frightening,” but that the pilot did an excellent job returning to the airport.
Southwest Airlines said its maintenance teams were examining the aircraft. The affected passengers were flown on another flight to Houston about three hours behind their scheduled arrival time.
The incident is the latest in a string of issues to plague Boeing.

















