Airlines don't control airports, air traffic control or airport security. Flying has become a bad experience largely in the areas airlines are powerless to correct. Granted, marginally solvent entities probably don't have the capital to support these facilities too, but this just says the business model is very broken as it stands today.

Could airports, air traffic control or the security detail (excluding the TSA) actually pay for themselves from flight revenues? I would guess they should since we won't go back to ocean liners or zeppelins.