Airlines like US Airways could have worked well if they sorted out these landing charges and, if they maybe decided to make it year round and had been more confident in it .
What do you mean? They tried it for one season and passenger yield and volume were below expectations. It really was that simple, if it had been wider issues they'd have persevered. Indeed they have now expanded at SNN and dropped LGW having remained seasonal at GLA. Being "confident in it" had absolutely nothing to do with it, demand wasn't there to make enough money.