Never before in the ninety-eight-year history of American aviation had such a command been given. There were 4,546 civilian aircraft over the United States at the time, from private Cessnas to jumbo jets, and they all scrambled to find a place to land. Closing airspace had its most disorienting effect, though, on approximately four hundred international flights headed toward the United States, the majority of which were coming across the Atlantic from Europe. While some of these planes were able to turn around, the only option for most was to land in Canada. Although officials in the United
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