WN3695 - Engine Cowling Detaches During Takeoff

Southwest Airlines flight 3695 departed Denver International Airport (DEN) on the morning of 7 April 2024, bound for William P. Hobby Airport (HOU) in Houston, Texas. The Boeing 737-800 was carrying 135 passengers, two lap-held infants, and six crew members for a total of 143 occupants. During the takeoff roll, the engine cowling—the aerodynamic covering of the engine—separated from one of the aircraft's engines and struck the wing flap, causing structural damage. The pilot immediately notified the Denver tower, reporting: "We have a piece of the engine cowling hanging off apparently." The flight crew declared an emergency and returned to Denver International Airport, landing safely at approximately 8:15 a.m. local time. According to the pilot, while the engines appeared to function normally, the aircraft had sustained structural damage. Passengers aboard the flight reported they did not hear or feel anything unusual during the incident, though photographs of the damage quickly circulated through the cabin. Upon landing, the aircraft was towed to a gate where all passengers safely deplaned. No injuries were reported. The Federal Aviation Administration (FAA) initiated an investigation into the cause of the cowling separation.