For me, one of the real irritants in air travel is waiting for luggage at the big airports. I don’t mind the waiting so much, but people crowd up right to the edge of the carousel so that others cannot see the bags that are coming. And it’s even worse when they bring the luggage trolleys up to the carousel. Bangkok puts this red-and-blue line around the carousel and asks people to stay behind it, and then everyone can see. Obviously (see the photo) not everyone follows this directive but it sure makes things better.