The assumption is that as they become fewer, the ones that remain gain staying power. Which is why I excepted JetBlue since they could get sold or fail, I think they are hoping their Spirit purchase goes through.

Crazy to think JetBlue wanting Spirit. I remember when JetBlue started, their goal was to provide a better experience than all the other airlines. It is really a cutthroat business. Virgin Airlines had to be folded into Alaska too.