Fair enough. Maybe I'm spoiled by modern airports, which Heathrow definitely is not. When I change at modern airports, usually in Europe, I very rarely have to

Fair enough. Maybe I'm spoiled by modern airports, which Heathrow definitely is not. When I change at modern airports, usually in Europe, I very rarely have to go out and back in again. In Geneva[1], the layout of the airport was essentially reconfigured around me to let me walk from one plane to the next. I was the only person doing it; I walked through empty glass-walled corridors, watching through the glass as other passengers went their various ways, guided by wall displays pointing me towards the next flight (no other flights on it; just mine) and at one point I got to a train platform cut in half by a glass wall. The other side was a hundred or so people, and when the train came, I was in one half, and they were in the other. We were likewise segregated at the destination platform. I walked all the way to the departure lounge before I reached a person, whose job was to let me in and not let anyone in the lounge leave through my private entrance. It was basically how you'd expect a modern airport to work; to know who on each flight needed to leave and who needed to be guided to another flight, and for the displays and corridors to provide it. [1] I think it was Geneva.