Lyndon Johnson was.
Lyndon B. Johnson was the only president sworn into office on an airplane.
Lyndon Johnson was sworn in while on his way back to Washington after the death of Kennedy in Dallas.
Lyndon B. Johnson was sworn into office on an airplane after the John F. Kennedy assassination.
Johnson was sworn in while the plane was sitting on the ground in Dallas. When it took off, it headed for Washington, DC.
1963 was the year that Lyndon Johnson was sworn in while sitting in the presidential plane on a runway in Dallas, TX after the death of President Kennedy.
Lyndon B. Johnson (LBJ) was sworn in on an airplane on November 22, 1963 after John F. Kennedy was assassinated. The swearing in was done by a local justice of the peace and the more formal swearing in by the Chief Justice was done at a later time. He was also the first president to be sworn in by a woman. The airplane , Air Force One, was sitting at Love Field, Dallas, Texas.
Lyndon B. Johnson (LBJ) was sworn in on an airplane on November 22, 1963 after John F. Kennedy was assassinated. The swearing in was done by a local justice of the peace and the more formal swearing in by the Chief Justice was done at a later time. He was also the first president to be sworn in by a woman. The airplane , Air Force One, was sitting at Love Field, Dallas, Texas.
Lyndon Johnson took the Presidential Oath of Office aboard the presidential airplane waiting to carry the body of John F. Kennedy back to Washington, DC from Dallas, Texas. He was sworn before the plane took off by a local JP who happened to be female. This also makes him the first president to be sworn in by a woman.
The first time he became president, it was because Kennedy was killed and he had to assume office immediately. He was sworn in by a local justice of the peace while sitting in the presidential airplane. For his second term he had a standard inauguration and was sworn in by the chief justice.
Lyndon Johnson was sworn in office on Air Force One, but I do not know of any presidents sworn in out of the U.S.
A national disaster does not change when the president-elect gets sworn in to office. However, it might change the location of where he is sworn in to office.
The President is customarily sworn into office on the steps of the US Capitol building.