A United Airlines flight landed safely at Denver International Airport on Saturday after its right engine failed, the Federal Aviation Administration said, with dramatic images showing debris from the plane scattered on the ground. Images posted by police in Broomfield, Colorado showed significant plane debris on the ground, including an engine cowling scattered outside a home and what appeared to be other parts in a field. Because of the United fan blade separation incident, Pratt & Whitney, which is unit of Raytheon, reviewed inspection records for all previously inspected PW4000 fan blades, the NTSB said.