From the French word saboter, sabotage refers to the act of bungling, botching or wrecking something, particularly for political or military aims.  It is derived from the French word for a wooden shoe, a sabot and likely refers to clumsy work carried out by those peasants who clattered about in such simple footwear. The world of aviation escaped known acts of sabotage until 1933 when a sleek and streamlined Boeing 247 of United Air Lines Flight 23 taxied to the departure gate at Newark Airport to allow it’s passengers to embark.  At a time when most airlines were flying flimsy wood and cloth biplanes that looked like old World War One bombers, and indeed many were, Boeing were ahead of the game.
The Boeing 247
 
An early 247 with the forward sloping windshield flying for the Royal Air Force
 
Passengers embarking on a United 247 NC13345 which later crashed into a hill in dense fog and burned.
 

 
J Edgar Hoover’s letter closing down the sabotage investigation
 
Images under Creative Commons licence with thanks to Boeing, the SDASM, the RAF, United Airlines, the Library of Congress, the Chicago Tribune and the FBI.

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