1933
- March 28 – The 1933 Imperial Airways Dixmude crash of an Armstrong Whitworth Argosy II is the first suspected case of air sabotage; all 15 on board are killed.
- October 10 – The United Airlines crash near Chesterton: a Boeing 247 is destroyed by a bomb over Chesterton, Indiana in the first proven case of air sabotage on a commercial aircraft; all seven on board are killed.
- December 30 – In the 1933 Imperial Airways Ruysselede crash in Belgium, an Avro Ten collides with a radio mast, killing all 10 on board.
Read more about this topic: List Of Accidents And Incidents Involving Commercial Aircraft