Businessweek:

Would you “scam” an airline’s ticketing policy if it saved $25? $70? $400?

A federal lawsuit is bringing public attention to “hidden city” ticketing, the technique of buying an airline ticket between two cities with a connection but ditching the rest of the trip. Say, for example, you want to fly from Boston to San Francisco but notice that a ticket from Boston to Seattle—with a connection in San Francisco—is cheaper. Once your flight lands in San Francisco, you prance out of the airport at your intended destination, pocketing the savings.

Airlines hate this maneuver—which has been around for decades—and argue that it violates the terms of the sale.

I’m normally not a fan of “scams” but the airlines have screwed us so often and in so many different ways, I’d have no problem using this method to save money.