in boom times, all the stupidity comes out. money is free and cheap. stupid sells and survives... EOS was an idea not really stupid, but grossly limited in terms of their market. Midway had a great market and loyal customers, but when recession struck, they too saw the reality of a bloated cost structure and being too small too to generate enough cash to survive.
these ideas never make it when the levee breaks.
conversly, airtran, is big enough, in my view and Midwest is not. allegiant can make it since they compete with no one in the markets they serve. No sooner than they had pulle out of GSO and SX had quit, they came back in. they are different in their approach which is why they will make it...I would be shocked if allegiant filed.