From The Wall Street Journal:
Airlines "are the world's best price discriminators," said Jan Brueckner, an economics professor at the University of California, Irvine, specializing in the airline industry. He notes U.S. travelers in general pay more to fly to Europe than Europeans pay to fly to the U.S. because a stronger economy on the U.S. side pushes fares higher for trips that originate in the States…. In addition, busy airports with lots of flights to other big airports typically have lower fares, Dr. Brueckner says.

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