Due to the winter rain at YVR airbridge is a must. The new airbridge front jetway is positioned manually. When the front operation is completed, the operator press a button and the aft jetway to position it self over the wing and on to aft door by automation. The operator being very careful to select the right type of aircraft or the rear jetway may hit the 737-700 winglets. Westjet opetate 732 and 73G. These jetway are designed just for narrow body aircraft. Passengers deplane from the front jetway and new pax board from the rear. Westjet 20 minute turn around is for better aircraft utilisation.