@Pavlik 4 October 2021 more from that month

I found an interesting fact. Cooper's shoulder blade. One of the few (or the only one?) devices named after an unknown person. On November 24, 1971, Dan Cooper (alias) hijacked a Northwest Orient Airlines Boeing 727-51 en route from Portland to Seattle. After receiving a ransom of $200,000, the hijacker released the passengers, forced the pilots to take off and parachuted out about 50 kilometers northeast of Portland. Despite a lengthy investigation, the FBI was unable to identify the hijacker or find out his fate, and in July 2016, the investigation was officially suspended. The case of Dan Cooper remains the only unsolved hijacking in the history of commercial aviation. In 1972, 31 hijacking attempts were recorded in the United States (in 15 cases, hijackers attempted to jump out of the plane, as Cooper did). In order to somehow block this life hack, the FAA ordered to equip all Boeing 727s with a Cooper Blade. This is a simple "latch". In the parking lot, a light spring keeps it in the open position (as in the photo) and it does not interfere with opening the hatch. And when flying, a strong air flow presses on its blade and turns, thereby closing the hatch. Does anyone constantly wonder why planes don't have parachutes to jump out in case of an accident? So, among other reasons, one of them is that everything is done so that no one jumps out.