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flag US engineers winterized WWII aircraft in Minnesota to prevent engine freezing.

flag During World War II, the U.S. government established a top-secret facility in St. Paul, Minnesota, to solve the problem of bomber engines freezing in Arctic conditions. flag Engineers from Northwest Airlines and the military collaborated to "winterize" aircraft, testing de-icing systems in extreme winter storms to ensure safe flight. flag Their innovations enabled safe operations in sub-zero temperatures and contributed significantly to Allied success, with over 3,000 aircraft processed before the war ended.

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