I think you are wrong. Isn't most airliners losing money year after year? It is a losing business model and sooner than later... USA is going to have to bail them out... again
Most does not mean bargain carriers..
Southwest made a killing until their fuel contracts ran out, in the same way Jet blue makes money (they are hurting now but who is not)
http://www.nypost.com/seven/01312007/business/jet_blue_swings_a_profit_business_.htm