What bubble are we talking about anyway?
What about the stockmarket hype surrounding some of these airlines? Admittedly, easyJet and Ryanair offer a good return, as they are profitable, but is the huge market capitalization (compared with the likes of BA, Air France, etc.) sustainable in the long run?
My guess is that this is at least one part of the "low-cost bubble" that is bound to burst at one point...
JieFang.