An IATA airport code is a three-letter identifier assigned by the International Air Transport Association. These are the codes you see on your boarding pass, luggage tags, and flight booking sites — SEA for Seattle-Tacoma, LHR for London Heathrow, JFK for New York's John F. Kennedy.

IATA codes cover around 9,000 airports that handle commercial passenger traffic. They prioritize readability and are designed to be easy for travelers to recognize.

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Explained

What is an ICAO airport code?

An ICAO airport code is a four-letter identifier assigned by the International Civil Aviation Organization. Used by pilots, air traffic controllers, and aviation professionals, ICAO codes cover every airport and airfield globally — including small general aviation strips with no commercial service.

ICAO codes follow a geographic prefix system: K for the contiguous United States, EG for England, RJ for Japan. KSEA is Seattle, EGLL is London Heathrow, RJTT is Tokyo Haneda.

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