Other forms: airlines
An airline is a company that owns and operates a fleet of planes. You might pick an airline for your trip to Hawaii based on who sells the least expensive tickets.
The airline is the business that maintains airplanes for commercial and business travel. Some people have a strong preference for one airline over another — you may enjoy flying with the airline that provides homemade cookies to its passengers, for example. Baggage handlers, flight attendants, and pilots all work for an airline. The original, 1813 meaning of airline was quite different: "a straight line between two points on the earth's surface."
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