An apparent trespasser who was fatally struck by a Frontier Airlines plane at a Colorado airport on Saturday was seen calmly walking across the runway while the aircraft barreled toward them, according to new surveillance footage. The victim, who has not been publicly identified, was sucked into one of the engines of the Airbus A321neo mid-takeoff at Denver International Airport. The person had jumped the perimeter fence and was on the tarmac when they were mowed down at 11:19 p.m., the airport confirmed. The person had jumped the perimeter fence at Denver International Airport and was on the tarmac when they were mowed down at 11:19 p.m. KHOU11 The victim appeared to be perfectly aligned with one of the plane’s engines when part of their upper body was sucked inside, according to the harrowing footage. KHOU11 New security video released by the City and County of Denver shows the horrifying moment the person was struck while walking on the runway.…