never heard of an airplane or a boat?
Oh those will be used but the numbers are drastically smaller than overland travel. So easy to close smalls airports and ground large planes. What the fuck do you think the TSA is for? Boats would be the best bed but they are slow and uncommon. Only the few coastal people would have access.
I do believe that the vast majority of the population lives within fifty miles of one of the coasts
Ok then... 50 million people will leave by personal watercraft
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