- Who
- United Airlines
- What
- first
- Where
- Indiana (Chesterton)
- When
A nitroglycerin explosive destroyed a United Airlines Boeing 247 on 10 October 1933 over Chesterton, Indiana - the first confirmed bombing of an aircraft.
On 28 March 1933, an Imperial Airways Armstong Argosy II crashed after a fire was started on board, possibly by a suicidal passenger; although impossible to prove, this could also be considered an act of sabotage.