|
| 7414 | Agronomy consulting services | |
| 8532 | Aid to families with dependent children (AFDC) | |
| 3530 | Ailerons, aircraft, manufacturing | |
| 8519 | Air ambulance services | |
| 3430 | Air bag assemblies, manufacturing | |
| 4530 | Air balancing contractors | |
| 7522 | Air base, military | |
| 3512 | Air boats, building | |
| 3430 | Air brake systems and parts, automotive, truck and bus, manufacturing | |
| 6220 | Air cargo carriers (except air courier), nonscheduled | |
| 6210 | Air cargo carriers (except air couriers), scheduled | |
| 6220 | Air cargo charter transportation service | |
| 3420 | Air cargo containers, light gauge metal, manufacturing | |
| 3420 | Air cargo containers, plastic, manufacturing | |
| 6309 | Air cargo customs clearances, service | |
| 6210 | Air cargo transportation service, scheduled | |
| 3120 | Air circuit breakers, manufacturing | |
| 2912 | Air compressors, manufacturing | |
| 2811 | Air cowls, sheet metal, manufacturing | |
| 2919 | Air curtains, manufacturing | |
| 5143 | Air ducts, sheet metal, wholesale | |
| 6210 | Air express transportation service, scheduled | |
| 3312 | Air flow controllers (except valves), air-conditioning and refrigeration, manufacturing | |
| 7522 | Air Force | |
| 6220 | Air freight charter transportation service | |
| 6301 | Air freight handling at airports | |
| 6210 | Air freight transportation service, scheduled | |
| 2424 | Air fresheners, manufacturing | |
| 4530 | Air handling systems, installation (duct work) | |
| 1729 | Air laid nonwoven fabrics, manufacturing | |
| 6220 | Air passenger carriers, nonscheduled | |
| 6210 | Air passenger carriers, scheduled | |
| 6220 | Air passenger charter transportation service | |
| 6220 | Air passenger transportation service, nonscheduled | |
| 6210 | Air passenger transportation service, scheduled | |
| 7512 | Air pollution control agencies | |
| 5143 | Air pollution control equipment and supplies, wholesale | |
| 2813 | Air pre-heaters for boilers, manufacturing | |
| 2919 | Air purification equipment, stationary, manufacturing | |
| 2930 | Air purifiers, portable, manufacturing | |
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