
passenger enplanements, but more than 10,000 annual enplanements. N: Nonhub that accounts for less than 0.05% of total U.S.S: Small hub that accounts for between 0.05% and 0.25% of total U.S.M: Medium hub that accounts for between 0.25% and 1% of total U.S.L: Large hub that accounts for at least 1% of total U.S.Each primary airport is sub-classified by the FAA as one of the following four "hub" types ( s): P- s: Commercial service – primary are publicly owned airports that receive scheduled passenger service and have more than 10,000 passenger boardings ( enplanements) each year.


It is not meant to be a complete list of cities served, which can be found in or added to each airport's Wikipedia article. This is not always the actual location since some airports are located in smaller towns outside of the city they serve. City served – The city generally associated with the airport, as per the airport's master record with the Federal Aviation Administration.This list contains the following information:
