| 83323 | Airfield runways, structural failure investigation of | |
| 83310 | Airfield runways, structural installation appraisal of | |
| 83323 | Airfield runways, technical inspection services during the construction of | |
| 83323 | Airfield runways, undertaking contamination studies of | |
| 83310 | Airfield runways, undertaking environmental impact studies of | |
| 83310 | Airfield runways, undertaking project impact studies of | |
| 83310 | Airfield runways, undertaking technical feasibility studies of | |
| 53213 | Airfield taxiways | |
| 54213 | Airfield taxiways, general construction of | |
| 44730 | Airguns (incl. those operated with other gases) | |
| 85511 | Airline reservation services | |
| 63392 | Airlines, food preparation and supply services to | |
| 68111 | Airmail service, postal | |
| 88825 | Airplanes manufacturing services | |
| 64222 | Airport limousine services, interurban | |
| 64114 | Airport limousine services, suburban | |
| 64114 | Airport limousine services, urban | |
| 67610 | Airport operation services (excl. cargo handling) | |
| 64115 | Airport shuttle services, non-scheduled | |
| 67620 | Airport-located radar stations, services of | |
| 67610 | Airports, operation of (excl. cargo handling) | |
| 49640 | Airscrews | |
| 49610 | Airships, whether or not rigid | |
| 84131 | Air-to-ground telecommunications services | |
| 43251 | Airwheels, windmill | |
| 37610 | Alabaster, calcareous or gypseous, further worked than roughly split or squared (excl. flagstones) | |
| 15120 | Alabaster, calcareous, unworked or not further worked than roughly split, roughly squared or squared by sawing | |
| 37610 | Alabaster, cut or sawn, with a flat or even surface (excl. flagstones) | |
| 15120 | Alabaster, gypseous, unworked or not further worked than roughly split, roughly squared or squared by sawing | |
| 15320 | Alabaster, in the form of powder, granules or chippings, whether or not heat-treated (excl. artificially coloured) | |
| 37610 | Alabaster, moulded, turned, polished, decorated, carved or otherwise worked (excl. moulded and agglomerated stone powder or granules) | |
| 34150 | Alanine and its salts and esters | |
| 85230 | Alarm monitoring services | |
| 46921 | Alarm system (anti-theft), other than those connected to the ignition system for motor vehicles | |
| 54613 | Alarm systems, burglar, installation of | |
| 54612 | Alarms, fire, installation of | |
| 04120 | Albacore, fresh or chilled | |
| 21210 | Albacore, frozen | |
| 04119 | Albacore, live | |
| 21242 | Albacore, prepared or preserved (excl. by simple freezing, salting, drying or smoking) | |