
This would make PDX a "Medium Hub" by total passengers, but a "Large Hub" under enplanements. M: Medium hub that accounts for between 0.25% and 1% of total U.S.passenger enplanements (Generally 18,500,000 total passengers and above). L: Large hub that accounts for at least 1% of total U.S.Each primary airport is further classified by the FAA as one of the following four "hub" types: This list only includes airports designated as Commercial service – primary (P). ROLE – One of four FAA airport categories.ICAO – The location indicator assigned by the International Civil Aviation Organization (ICAO).Those that do not match the FAA code are shown in bold. IATA – The airport code assigned by the International Air Transport Association (IATA).These are linked to that airport's page in the state's airport directory, where available.

FAA – The location identifier assigned by the Federal Aviation Administration (FAA).This is not always the actual location since some airports are located in smaller towns outside of the city they serve.

