S

Aircraft engine and aircraft frame maintenance; aircraft fueling; aircraft maintenance; avionics installation and repair; aircraft engine overhaul; installation of aircraft navigation, communications and cabin entertainment hardware; automotive maintenance; maintenance of aircraft ground support equipment, namely, land vehicles, baggage carts, refueling vehicles, lavatory service vehicles, potable water vehicles, tugs, tractors, golf carts, ground power units, cargo loaders, cargo transporters, belt loaders, stairs for loading and unloading passengers, and de-icing vehicles; and janitorial services in the field of aviation