I have a simple solution: They all ride an escalator that takes them up, then drops them down a funnel-like chute which sends them tumbling into the airplaning.
Deplaning is accomplished via a large piston which squeezes the passengers out some star or crescent moon shaped opening.
Run the passengers through a meat grinder. Then, fill the airplane with ground passenger like a sausage tube. Upon arrival, squeeze the paste into the terminal via a pumping device.