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4512-01 Airline Companies
4512-02 Air Cargo Service
4512-98 Air Transportation Scheduled
4513-01 Air Courier Services
4513-02 Expediters
4522-01 Helicopter Charter & Rental Service
4522-02 Air Ambulance Service
4522-03 Aerial Personnel Lifts
4522-98 Air Transportation Nonscheduled
4581-01 Aircraft Ground Support & Service Equip
4581-02 Aircraft Engines Servicing & Maintenance
4581-03 Aircraft Ferrying & Transporting Svc
4581-04 Aircraft Servicing & Maintenance
4581-05 Aircraft Storage
4581-06 Airports
4581-07 Aircraft Upholsterers
4581-08 Helicopter Servicing & Maintenance
4581-10 Aircraft Refinishing & Painting
4581-11 Airline Support Services