ground airport equipment 
Equipment and materials for preparing an aircraft for its next flight; this includes cleaning, performing checks, refueling and boarding.
passenger transfer vehicle
Vertically adjustable vehicle with a cabin for transporting passengers between the aircraft and the terminal.
Mobile staircase that is positioned manually at an aircraft door to allow passengers to enter or exit.
mobile passenger stairs
Truck that carries a telescopic staircase, which is positioned at an aircraft door to allow passengers to enter or exit.