An airline is a company that provides air transport services for travelin passengers an freicht. Airlines lease or ain thair aircraft wi which tae supply thir services an mey furm pairtnerships or alliances wi ither airlines for mutual benefit. Generally, airline companies are recognised wi an air operatin certificate or license issued bi a govrenmental aviation body.
Airlines vary frae those wi a single aircraft carryin mail or cargae, throu full-service internaitional airlines operatin hunders o aircraft. Airline services can be categorized as bein intercontinental, intra-continental, domestic, regional, or internaitional, an mey be operatit as scheduled services or charters.