A 22-year-old programmer named Aktarer Zaman made headlines this week when he was sued by United Airlines and Orbitz over his website Skiplagged, which helps travelers find cheaper fares through the practice of "hidden city" ticketing
. According to the complaint, United says the whiz kid "intentionally and maliciously" interfered with airline industry business relationships "by promoting prohibited forms of travel." But what is this practice
, and do the airlines have any right to shut it down?