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An engine cover on a Southwest Airlines Boeing 737-800 fell off during takeoff in Denver and struck the wing flap, prompting the Federal Aviation Administration (FAA) to open an investigation.
No one was injured and Southwest Flight 3695 returned safely to Denver International Airport on Sunday and was towed to the gate after losing the engine cowling.
The Boeing aircraft bound for Houston Hobby airport with 135 passengers and six crew members aboard climbed to about 10,300 feet (3,140m) before returning 25 minutes after takeoff.
Passengers arrived in Houston on another Southwest plane about four hours behind schedule. Southwest said maintenance teams are reviewing the aircraft.
The plane entered service in June 2015, according to FAA records. Boeing referred questions to Southwest.
The 737-800 is in the prior generation of the best-selling 737 known as the 737 NG, which in turn was replaced by the 737 MAX.
Southwest declined to say when the plane’s engine had last had maintenance.
ABC News aired a video posted on social media platform X of the ripped engine cover flapping in the wind with a torn Southwest logo.
Boeing has come under intense criticism since a door plug panel tore off a new Alaska Airlines 737 MAX 9 jet at 16,000 feet on January 5.
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