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In the US the emergence of low-cost airlines including Southwest and Spirit Airlines has contributed to a phenomenon that most flyers are surprised to discover.

BBC: How airline pricing works

Spirit airlines (joined with Allegiant and Southwest airlines) challenged the regulation, which had been upheld in the U.S. Court of Appeals last July.

FORBES: In the Face of All These Mergers, Will Airline Fares Become Unfair? And Will The Consumer Even Know?