The airport code is a three letter designator for a commercial airport, or other travel point -- e.g. a large bus station. These are the codes that airlines and pilots use to identify airports and are used in timetables, baggage tags, tickets, advertisements, Airline and Global Reservation Systems. There are approximately 9,000 of them in use of a total of 17,576 available. IATA in Geneva is responsible for the designation of these codes.
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