Southwest Flight Returns to Denver After Engine Cover Falls Off, Striking Wing

Southwest Airlines Flight 3695 returned to Denver airport after engine cowling fell off during takeoff, striking the wing flap
The Boeing 737-800 with 135 passengers, 2 infants, and 6 crew was headed to Houston before returning
The cowling is a protective cover over the engine, reducing drag and cooling the engine
The incident comes amid heightened scrutiny around Boeing after issues with Alaska Airlines flight in January
Website created allowing flyers to check if their flight is on a Boeing plane due to safety concerns