Nobody who sold you that instant oatmeal, jar of multivitamins, bar of soap, perfume-free laundry detergent, latest best-seller, NASCAR tickets or whatever Gwyneth Paltrow sells on her website will come after you to make sure you used your purchases.

But the world's biggest airlines might. They require that you fly all the flights you've booked or pay the price. They might take away your frequent flier miles, ban you from the airline or even sue you. "So, if I don't eat all my steak at Peter Luger's, are they going to sue me now?" Delta Air Lines frequent flier Billy Stocklin says. "It's my ticket and seat. I bought it. If I use it or not is none of your business."

The airlines beg to differ.

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