Planes are still full and prices have been going up. I don't think they are a good long-term investment, but someone has to fill the void they do. Spirit will be gone soon enough. One ULCC will continue on, I don't see anyone else taking on this part of the market. United can talk smack all they want about it, low fare options for leisure travelers is a massive market and you all if ULCC's were gone those Basic fares would disappear and this market would get left massively unserved.