An airline is a company that transports people and items using airliners.
An airline may have as few as one airplane or a fleet of hundreds of airplanes.
Most airlines offer regular flights between a group of airports.
An airline has many costs to establish and maintain air services: labor, fuel, airplanes, engines, spares and parts, IT services and networks, airport equipment, airport handling services, booking commissions, advertising, catering, training, aviation insurance and other costs.
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