Southwest Flight Returns Safely to Denver After Engine Cover Rips Off During Takeoff

Engine cover fell off Southwest Airlines Boeing 737-800 during takeoff from Denver airport on Sunday
Plane with 135 passengers, 2 lap infants, and 6 crew returned safely to Denver after crew reported issue
Engine cover struck wing flap; video shows cover blowing open then ripping off as plane moved on runway
Passengers heard loud noise; crew declared emergency and requested immediate return to Denver
Passengers flown to intended destination of Houston 3 hours late; Southwest maintenance reviewing aircraft