| Air Research Limited | Cobham | 1999 |
| Air Results Ltd | Braintree | 2024 |
| Air Revolution Technologies International Ltd | Horsham | 2020 |
| Air RS Consulting Ltd | St. Albans | 2026 |
| Air Safety Matters Limited | Hook | 2012 |
| Air Sale Holdings Limited | Southwold | 2014 |
| Air Service Events Ltd | Manchester | 2023 |
| Air Services (Europe) Ltd | Cardiff | 1997 |
| Air Services Sussex Ltd | Hayling Island | 2017 |
| Air Sheffield Ltd | Sheffield | 2014 |
| Air Sheriff Services Limited | Leeds | 2023 |
| Air Social Ltd. | Guildford | 2010 |
| Air Social Property Ltd | Guildford | 2021 |
| Air Solutions Group Ltd | Dunmow | 2024 |
| Air Solutions Ltd | Cheam | 2016 |
| Air Street Services Limited | London | 1997 |
| Air Supply Consulting Ltd | Brighton | 2021 |
| Air Support Limited | Weymouth | 2024 |
| Air Surveys Limited | Wandsworth | 1985 |
| Air Swft Limited | London | 2025 |
| Air Tech ECS Limited | Kidderminster | 2008 |
| Air Tech Environmental Consultancy Ltd | London | 2023 |
| Air Tech Integrity Limited | Auchterarder | 2012 |
| Air Technology Energy Limited | Loughborough | 1999 |
| Air Technology Limited | Loughborough | 1987 |
| Air Telecom Group Limited | Crewe | 2017 |
| Air Testing SW Limited | Bodmin | 2015 |
| Air Testing UK Ltd | Bury | 2006 |
| Air Theranostics Limited | London | 2023 |
| Air Transaction Limited | London | 2018 |
| Air Transport Publications Ltd | Maidstone | 2001 |
| Air Transportation Analytics Limited | Godalming | 2018 |
| Air Travel Consultants Limited | Glasgow | 2022 |
| Air View Engineering Ltd | Llandysul | 2021 |
| Air Water Ventures Ltd | Cardiff | 2022 |
| Air Worldwide Limited | London | 1995 |
| Air Xtreme Holdings Limited | Bristol | 2021 |
| Air Zero Refrigeration Ltd | Musselburgh | 2018 |
| Air Zone Technologies Ltd | London | 2023 |
| Air-Arms Limited | Hailsham | 2005 |
| Air-Bilal Ltd | Surrey | 2016 |
| Air-Conditioning Direct Current Ltd | Honiton | 2025 |
| Air-One Consulting Invest Ltd | Dover | 2025 |
| Air-Real View Ltd | Scunthorpe | 2022 |
| Air-Walker Limited | Liverpool | 2023 |
| AIR2YACHT Ltd | Manchester | 2024 |
| AIR2ZOOM Consulting Limited | Stevenage | 2022 |
| AIR4CASTS Limited | London | 2014 |
| AIR4U Ltd | Romsey | 2014 |
| AIR9 Ltd | Bedford | 2023 |
| Aira Advisory Ltd | London | 2026 |
| Aira Business Solutions Limited | Dorchester | 2015 |
| Aira Digital Limited | Milton Keynes | 2014 |
| Aira Global Consultancy Limited | London | 2026 |
| Aira Limited | Bicester | 2018 |
| Aira Match Ltd | London | 2026 |
| Airace Limited | Clitheroe | 2003 |
| Airah Limited | Stanmore | 2019 |
| Airaid Commissioning Ltd | Bingley | 2018 |
| Airam Consulting Limited | Belfast | 2026 |
| Airangel Limited | Altrincham | 2003 |
| Airasyst Limited | London | 1999 |
| Airav Consultancy Limited | Gerrards Cross | 2018 |
| Airay Limited | London | 2016 |
| Airbagsforsale (Hinckley) Limited | Coventry | 2014 |
| Airbase GSE Ltd | London | 2006 |
| Airbase Media Ltd | Manchester | 2007 |
| Airbiz Aviation Strategies Limited | Reading | 2015 |
| Airbnb Mastery International Limited | London | 2025 |
| AIRBNB2ME Ltd | Pevensey | 2022 |
| Airborn Vision Limited | Blackpool | 2011 |
| Airborne Armour Limited | Louth | 2019 |
| Airborne Art Limited | Alnwick | 2015 |
| Airborne Consulting Ltd | Newport | 2023 |
| Airborne Environmental Consultants Limited | Trafford Park | 1997 |
| Airborne Exploration Services Ltd | Bristol | 2018 |
| Airborne EYE Training Solutions Ltd | Ludgershall | 2020 |
| Airborne Holdings Limited | Maidstone | 2021 |
| Airborne Imagery Solutions Ltd | Atherstone | 2018 |
| Airborne Media Services Ltd | Cardiff | 2017 |
| Airborne Operations Limited | Southend-On-Sea | 2002 |
| Airborne Robotics Limited | Basingstoke | 2017 |
| Airborne Services Limited | Gillingham | 1996 |
| Airborne SIX Ltd | Basildon | 2025 |
| Airborne Studio Limited | London | 2016 |
| Airborne Surveillance (UK) Limited | New Milton | 2009 |
| Airborne Systems Pension Trust Limited | Bridgend | 1990 |
| Airborne UK Parent Limited | Manchester | 2010 |
| Airbourne Advisory Limited | Rochester | 2023 |
| Airbridge Solutions Limited | London | 2025 |
| Airbus Endeavr Wales | Newport | 2010 |
| Airbus Protect Limited | Newport | 2011 |
| Airbus Training Solutions Ltd | Romford | 2016 |
| Airc.Design Ltd | London | 2020 |
| Airc.Digital Ltd | London | 2021 |
| Aircal Limited | Northwood Hills | 2016 |
| Aircamo Aviation Ltd | Deeside | 2015 |
| Aircelle Pension Scheme Trustees Limited | Lancashire | 1989 |
| Airception Limited | Belfast | 2009 |
| Airch Ltd | Glasgow | 2024 |