Originally Posted by Bluedriver

MCO and LAS are considered low-yield leisure markets. MIA/FLL is a little more mixed.

The most profitable airline hubs are large metros with lots of industry/business travel and a large middle class of travelers who go lots of places, only a few of which are Mickey Mouse and Lost Wages. But in fairness that hasn't yet worked for an ULCC, so for them so far the low yield leisure markets are the best they've got.