Airport ground handling is a self-owned air transport service and an important additional service of civil and military air stations at all levels since the construction and operation of major airports, which is closely related to the operation of air stations and indispensable. All civil, commercial and military aircraft require ground handling services. All logistics services (oil supply, water supply, passengers getting on and off the plane, baggage handling, aircraft) during the downtime from the time the plane enters the apron to the time it leaves the apron and enters the taxiway.
References:
Baidu encyclopedia-ground service