![]() ![]() 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):
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