Rigorous security checks that today's air travellers may find petty and arbitrary have their roots in an infamous hijack that happened exactly 48 years ago.
On November 24, 1971, a man known as DB Cooper parachuted from an airliner over the north-west US with a cash ransom he'd demanded after threatening to blow it up. He and nearly all the money he extorted were never seen again. The hijacking of Northwest Orient Airlines Flight 305 triggered a decades-long FBI investigation and is the only case of its kind never to be solved in the US. The brazen heist generated huge public interest and was celebrated in song, film and literature for years to come.
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