Understand your points fully but the question has to be asked as to what improvements have been made recently to LTN.
It was always going to be the case that the more years that pass into a concession the less money is invested, as the payback period on that investment is reduced. Let’s remember that one day the airport will be handed back to the council so it will always be in the interests of Albertis to spend as little as possible on non essential upgrades in the final years.
Saying that Albertis is spending money, if not reluctantly, on capital projects like replacing the aging CAT3 ILS. Also although it is hated by the uses of the airport money has been spent in the CTA on so called traffic improvments.