This major group includes establishments engaged in furnishing domestic and foreign transportation by air and also those operating airports and flying fields and furnishing terminal services. Establishments primarily engaged in performing services which may incidentally use airplanes (e.g., crop dusting and aerial photography) are classified according to the service performed.
Industry Group 451: Air Transportation, Scheduled, And Air Courier
·4512 Air Transportation, Scheduled
·4513 Air Courier Services
Industry Group 452: Air Transportation, Nonscheduled
·4522 Air Transportation, Nonscheduled
Industry Group 458: Airports, Flying Fields, And Airport Terminal
·4581 Airports, Flying Fields, and Airport Terminal Services

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