Airlines and airports have at best a love-hate relationship, at the moment it's closer to hate-hate.
What's happening now is the same as what happened after 9/11 - passenger numbers down, movements down, therefore airport receipts down. obvious remedy is to push up fees.
In Europe the worst excesses will be dealt with by the EU Airport Charges Directive. You would not belive how hard the airports have been lobbying to block it or have it watered down.