This makes me wonder when the "low cost airline bubble" will burst*. Does charging low fees to airlines mean there is little money in the pot to pay for extensive and unexpected repairs, like the issue at GSE?
* = I have recently paid fares as low as ^13.99 for Stansted to Gothenburg City and ^19.99 for Stansted to Gdansk. I cannot see any way the airline and airport can cover their costs with these airfares alone.
They don't have to. Or, rather, they only need to cover the true marginal fuel cost of the weight of one more passenger. That's bigger than for a train, but still tiny. The cost of operating a service is pretty well fixed, certainly on the day, and largely over a whole timetable year.
Of course that's only possible if that very low cost paid by your marginal passenger does not reduce what the rest of your planeload are paying.