The role of airlines
An airline is an enterprise that provides civil aviation services for passengers and goods with various aircraft, and generally needs an officially recognized operation certificate or approval. The aircraft used by airlines can be owned or leased, can provide services independently, and can also form partners or alliances with other airlines. The size of an airline can range from a plane carrying mail or goods to an international airline with hundreds of planes providing various global services. The service scope of airlines can be divided into intercontinental, intercontinental and domestic, and can also be divided into flight service and charter service.