| 66290 | Air transport services of other freight | |
| 66120 | Air transport services of passengers, non-scheduled | |
| 91134 | Air transport, administrative services related to | |
| 67790 | Air transport, other supporting services for | |
| 66290 | Air transportation of individual articles in specially constructed shipping containers | |
| 66290 | Air transportation of individual packages in specially constructed shipping containers | |
| 34250 | Air, compressed | |
| 34250 | Air, liquid, whether or not rare gases have been removed | |
| 96151 | Air, open, projection of motion pictures in | |
| 96152 | Air, open, projection of videotapes in | |
| 83561 | Air, testing and analysis of | |
| 43912 | Air-conditioners, window-or wall-type, self-contained, comprising a motor-driven fan and elements for changing the temperature and humidity | |
| 43912 | Air-conditioning machines (excl. self-contained window- or wall-type) fitted with air cleaners and provided with devices for temperature and humidity control | |
| 43912 | Air-conditioning machines incorporating a refrigerating unit and a valve for reversal of the cooling/heat cycle (excl. self-contained window- or wall-type) | |
| 43912 | Air-conditioning machines, whether or not self-contained, not fitted with a device for sepa- rately regulating the humidity (excl. self- contained window- or wall-type) | |
| 43912 | Air-conditioning machines, whether or not self-contained, not incorporating a refrigerating unit (excl. self-contained window- or wall-type) | |
| 87149 | Aircraft engines, maintenance and repair of | |
| 67790 | Aircraft fire prevention services | |
| 67790 | Aircraft firefighting services | |
| 71332 | Aircraft insurance policies, underwriting of (excluding those owned by individuals) | |
| 71334 | Aircraft insurance policies, underwriting of (including those owned by individuals) | |
| 38540 | Aircraft model kits | |
| 67910 | Aircraft space, brokerage of | |
| 83569 | Aircraft, certification of | |
| 49623 | Aircraft, fixed-wing, mechanically-propelled, of an unladen weight exceeding 2,000 kg | |
| 66400 | Aircraft, freight-carrying, rental and leasing of, with crew | |
| 49612 | Aircraft, lighter-than-air, with or without propelling machinery | |
| 87149 | Aircraft, maintenance and repair of | |
| 67790 | Aircraft, maintenance and upkeep of, not involving repairs | |
| 83563 | Aircraft, mechanical testing and analysis of | |
| 66400 | Aircraft, passenger-carrying, rental and leasing of, with crew | |
| 83814 | Aircraft, photographing of landscapes and other surfaces from | |
| 83814 | Aircraft, photographing of structures from | |
| 92900 | Aircraft, pilot instruction services for | |
| 66400 | Aircraft, rental of, with operator | |
| 73116 | Aircraft, rental or leasing of, without operator | |
| 81130 | Aircraft, research and experimental development concerning | |
| 67790 | Aircraft, towing of | |
| 38540 | Aircraft, toy | |
| 49319 | Aircraft-carriers | |