No US president ever died on an airplane or from an airplane accident.
Neither
Lyndon Johnson took the oath as soon as it was realized that President Kennedy was killed in Dallas in 1963.
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Lyndon B. Johnson was sworn into office on an airplane after the John F. Kennedy assassination.
Theodore Roosevelt was the first US President to ride in an airplane. It was a Wright Brothers flyer.
Lydon B. Johnson
Not sure if this counts, since it was on the ground at the time, but Lyndon B. Johnson was sworn in on the President's aircraft.Technically, it was not Air Force One until he was sworn in as AF1 is not the name of the aircraft, but the call sign of any airplane carrying the President of the United States.
Airforce 1
By airplane
Lyndon Johnson was.
The airplane that the president is flying on receives the designation Air Force One.