The thing is helicopters are different from airplanes An airplane by it's nature wants to fly, and if not interfered with too strongly by unusual events or incompetent piloting, it will fly.

EST and opened with the repeat of an announcement by Frank Stanton then president of CBS which had already been relayed by Collingwood:
He later reported on the arrival of Kennedy's body to Washington D. )
Reasoner's next appearance came two days later Sunday and as he was at the anchor desk Oswald was shot by Jack Ruby while being moved in the Dallas City Jail.