“In July, when a hike in the security fee takes effect, the typical $300 domestic airline ticket will include $63 in ticket taxes and other government levies. That’s effectively 26 percent of the base fare of $237.40. You not only get dinged by the 7.5 percent federal ticket tax, but a ‘flight segment tax,’ an airport passenger charge and the aforementioned security fee. In its budget, the White House is proposing even more tax hikes on your ticket. And for international travel it’s even more confusing, with a mess of charges like ‘user fees’ for Customs and immigration. That means flying is getting close to sin tax territory— with punitive levies partly aimed at discouraging consumption.”
http://www.cntraveler.com/stories/2014-05-15/where-your-air-fare-taxes-and-fees-really-go