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Sometimes you just don’t learn. I said I wouldn’t ever do it again, but then I did it: I booked a late flight so I could put in a full day of work before flying to Toronto for a business meeting.

Weather delays turned a simple hour-long flight from New York to Toronto into an eight-hour odyssey. My anticipated night of indulgent relaxation became a few hours of sleep before a big meeting. And to make matters worse, I was delayed on the return, too. (In fact, the delays were so bad that a friend asked if I was angling to become a Canadian citizen!)

So I checked in with some of the smartest travelers I know to get their tips on flying for a business trip. You should heed this advice. These travelers have done the hard work and learned their lessons so that you don’t need to make the same mistakes, too. Here are the 15 worst mistakes you can make when flying.

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