| 91230 | Aid to foreign countries, military, administrative services related to | |
| 49640 | Ailerons | |
| 73230 | Air conditioners, room, rental or leasing of | |
| 54632 | Air conditioning, installation of | |
| 88720 | Air or gas guns and pistols manufacturing services | |
| 88763 | Air or other gas compressors manufacturing services | |
| 88763 | Air or vacuum pumps manufacturing services | |
| 44730 | Air rifles | |
| 53122 | Air terminals | |
| 54122 | Air terminals, general construction of | |
| 67190 | Air terminals, handling of baggage at | |
| 67610 | Air terminals, passenger, services of | |
| 67620 | Air traffic approach control | |
| 67620 | Air traffic control services | |
| 67620 | Air traffic landing control | |
| 67620 | Air traffic take-off control | |
| 65311 | Air transport services of letters and parcels | |
| 65319 | Air transport services of other freight | |
| 91134 | Air transport, administrative services related to | |
| 67630 | Air transport, other supporting services for | |
| 65319 | Air transportation of individual articles in specially constructed shipping containers | |
| 65319 | Air transportation of individual packages in specially constructed shipping containers | |
| 34250 | Air, compressed | |
| 34250 | Air, liquid, whether or not rare gases have been removed | |
| 96150 | Air, open, projection of motion pictures in | |
| 96150 | Air, open, projection of videotapes in | |
| 83441 | 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 | |
| 88769 | Air-conditioning (including for motor vehicles) manufacturing services | |
| 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 separately 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) | |
| 88745 | Aircraft engine instruments manufacturing services | |
| 87149 | Aircraft engines, maintenance and repair of | |
| 67630 | Aircraft fire prevention services | |
| 67630 | 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) | |
| 88824 | Aircraft manufacturing services | |