It does quote "In practice it would be very hard to implement a principle of serving the last in most physical queues where people physically queue up, for exam

It does quote "In practice it would be very hard to implement a principle of serving the last in most physical queues where people physically queue up, for example when boarding an airplane. It's simply too difficult to manage for practical reasons." There's a real-world variation. At some airports people at the terminal go into a bus, which then takes them to a plane. This serves to mix and somewhat invert the queue, since the last people on the bus become the first to enter the plane. The question I have is, is there a change in the gate queuing behavior between flights that load directly at the gate, vs. one where people first enter a bus?