US Airways and America West advertise that they are the world's largest low-fare airline when in fact, from the fares I have checked, are only a "low-fare" carrier in markets where they compete with WN, JetBlue, AirTran, etc. Don't all airlines pretty much match other airlines' fares? If that be the case, and with AA be much, much larger than the new US Airways, isn't AA the world's largest low-fare carrier? Any thoughts?