Ah, Cybersaz, airports make a profit (even govt owned ones) - everytime a jumbo lands they get a good few thousand from the airline, plus they get heaps in rent from the airport shops. So they don't need public money.
My favority in Schipol (Amsterdam) its nice n' simple with 2 wings forming a V, with departures upstairs & arrivals downstairs, & the main entrance in the middle with the bus ranks right out front. Also the railway platforms are directly underneath the airport terminal, so all one has to do to catch a train is buy a ticket from the store in the terminal & go to the escalator that runs up & down between arrival & departures & just keep taking the down escalators & your on the platform itself. Plus all flights whether domestic (Europe) or international depart & arrive at the same terminal. So there's none of that changing terminal crap & having to get an airport bus or train just to change planes.
Whereas Heathrow really sucks, first there's 4 seperate terminals, so it can be a real hassle changing flights, depending on the terminal you can be going down heaps of stairs & lifts & walking along all these passages & hallways, just to get to the railway platform, to change planes. Also its serviced by 2 completely different railway networks (the direct one & the tube) which confuses things even more. I don't like San Fransisco Airport either, but that may have changed over the last 10/15 years.