Transportation By Air
| SIC8 | DESCRIPTION |
| 4512-0000 | AIR TRANSPORTATION SCHEDULED |
| 4512-9901 | AIR CARGO CARRIER SCHEDULED |
| 4512-9902 | AIR PASSENGER CARRIER SCHEDULED |
| 4512-9903 | HELICOPTER CARRIER SCHEDULED |
| 4513-0000 | AIR COURIER SERVICES |
| 4513-9901 | LETTER DELIVERY PRIVATE AIR |
| 4513-9902 | PACKAGE DELIVERY PRIVATE AIR |
| 4513-9903 | PARCEL DELIVERY PRIVATE AIR |
| 4522-0000 | AIR TRANSPORTATION NONSCHEDULED |
| 4522-0100 | NONSCHEDULED CHARTER SERVICES |
| 4522-0101 | AIR PASSENGER CARRIERS NONSCHEDULED |
| 4522-0102 | FLYING CHARTER SERVICE |
| 4522-0103 | SIGHTSEEING AIRPLANE SERVICE |
| 4522-9901 | AIR CARGO CARRIERS NONSCHEDULED |
| 4522-9902 | AIR TAXIS |
| 4522-9903 | AMBULANCE SERVICES AIR |
| 4522-9904 | HELICOPTER CARRIERS NONSCHEDULED |
| 4581-0000 | AIRPORTS FLYING FIELDS AND SERVICES |
| 4581-0100 | HANGARS AND OTHER AIRCRAFT STORAGE FACILITIES |
| 4581-0101 | AIRCRAFT STORAGE AT AIRPORTS |
| 4581-0102 | AIRPORT HANGAR RENTAL |
| 4581-0103 | HANGAR OPERATION |
| 4581-0200 | AIRCRAFT MAINTENANCE AND REPAIR SERVICES |
| 4581-0201 | AIRCRAFT CLEANING AND JANITORIAL SERVICE |
| 4581-0202 | AIRCRAFT SERVICING AND REPAIRING |
| 4581-0203 | AIRCRAFT UPHOLSTERY REPAIR |
| 4581-0300 | AIRPORTS AND FLYING FIELDS |
| 4581-0301 | AIRPORT |
| 4581-0302 | FLYING FIELD EXCEPT THOSE MAINTAINED BY CLUBS |
| 4581-0303 | MILITARY FLYING FIELD |
| 4581-9901 | AIR FREIGHT HANDLING AT AIRPORTS |
| 4581-9902 | AIRPORT CONTROL TOWER OPERATION EXCEPT GOVERNMENT |
| 4581-9903 | AIRPORT LEASING IF OPERATING AIRPORT |
| 4581-9904 | AIRPORT TERMINAL SERVICES |
| 4581-9905 | AIRFREIGHT LOADING AND UNLOADING SERVICES |
| 4581-9906 | FIXED BASE OPERATOR |
