Air transport of passengers, cargo, and freight; airport baggage checking; ground support services in the field of air transportation, namely, airport services, cargo handling, baggage handling, namely, marking, sorting, loading, unloading, transfer, and transit of passengers' luggage, providing information concerning baggage in transit and delivery, air travel passenger ticketing and check-in services, and airport ramp services; Repair and maintenance of aircraft, vehicles, aircraft-related facilities, baggage-related facilities, and air travel-related facilities; refueling of aircraft and land vehicles; ground support services in the field of air transportation, namely, aircraft de-icing services, aircraft interior and exterior cleaning, and sanitation