The Japanese used suicide pilots in the 40s. The leap to airliners is not so big.
For something in the terrorism realm, check out Air France 8969. It was hijacked with the intent of using it to destroy the Eiffel tower (either by crashing into it or by blowing up the plane over it). It never happened because the French discovered the plan while the plane was on the ground and attacked it.
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The Japanese used suicide pilots in the 40s. The leap to airliners is not so big.
For something in the terrorism realm, check out Air France 8969. It was hijacked with the intent of using it to destroy the Eiffel tower (either by crashing into it or by blowing up the plane over it). It never happened because the French discovered the plan while the plane was on the ground and attacked it.