| Airplus Renewables Ltd | Liverpool | 2019 |
| Airpocket Designs Limited | Northampton | 1995 |
| Airpool Limited | High Wycombe | 2019 |
| Airport Advertising Limited | Manchester | 1992 |
| Airport and Navigation Solutions Limited | Cirencester | 2013 |
| Airport Baggage Integration Limited | Bury | 2011 |
| Airport Capacity Solutions Limited | Northampton | 2007 |
| Airport City (Manchester) Limited | Manchester | 2013 |
| Airport Consultants and Resourcing Ltd | Wotton-Under-Edge | 2022 |
| Airport Design Consult Ltd | Colchester | 2008 |
| Airport Fire Safety Ltd | Eastleigh | 2013 |
| Airport Holdings NDH1 Limited | Leeds | 2007 |
| Airport Marketing Limited | Chelmsford | 2016 |
| Airport Noise Management Services Limited | Woking | 2020 |
| Airport Parking & Hotels (Birmingham) Limited | Crawley | 2002 |
| Airport Parking & Hotels (Manchester) Limited | Crawley | 1984 |
| Airport Parking (Gatwick) Limited | Crawley | 1995 |
| Airport Planning Ltd | Oughtibridge | 2021 |
| Airport Project Management Consultants Limited | Bourne End | 2007 |
| Airport Recruitment Limited | Uckfield Road Ringmer | 2002 |
| Airport Safeguarding Limited | Darlington | 2020 |
| Airport Solutions Ltd | Wilmslow | 2004 |
| Airport Systems Engineering Limited | Milton Keynes | 2017 |
| Airports Centre of Excellence Limited | Glasgow | 2017 |
| Airprime Ltd | Preston | 2002 |
| Airqit Ltd | London | 2025 |
| Airqualitymonitors Ltd | London | 2026 |
| Airradio Limited | Derby | 2009 |
| Airrated Ltd | Manchester | 2018 |
| Airrep (Holdings) Limited | Horley | 1998 |
| Airrevo Limited | Bristol | 2023 |
| Airriess Construction and Engineering Ltd | Stockport | 2026 |
| Airrow Ltd | Colindale | 2017 |
| Airs Consulting Limited | Ashford | 2024 |
| Airs Productions Limited | Haywards Heath | 2025 |
| Airsafe Surveys Limited | Alton | 2009 |
| Airscape Consultants Limited | Bricket Wood | 2023 |
| Airscape Holdings Limited | London | 2017 |
| Airscape UK Limited | London | 2019 |
| Airsealand Industries Holdings (UK) Ltd. | Ashford | 2013 |
| AIRSEALAWYERS4U Ltd | London | 2026 |
| Airsense UK Ltd | Louth | 2021 |
| Airserv Compliance Ltd | Canvey Island | 2023 |
| Airservices UK Limited | Wallington | 2000 |
| Airshield Ltd | London | 2020 |
| Airshiny Ltd | South Croydon | 2007 |
| Airshow Ltd | Potters Bar | 2023 |
| Airside Airport Equipment Thorough Examinations Limited | Farnborough | 2009 |
| Airson Consulting (UK) Ltd | Enfield | 2019 |
| Airsound Ltd | London | 2024 |
| Airsource Cooling Ltd | Tingley | 2020 |
| Airsource Heat Pump Services Ltd | Liverpool | 2025 |
| Airsourceuk Ltd | Reading | 2019 |
| Airspace Advisory Ltd | London | 2020 |
| Airspace Avionics Limited | London | 2001 |
| Airspace Locations Limited | London | 2019 |
| Airspection Limited | Glasgow | 2022 |
| Airspeed Aviation Limited | Egginton | 1982 |
| Airspeed Electronics Ltd | Aylesbury | 2018 |
| Airsphere Limited | Surrey | 2017 |
| Airsprung Beds Limited | Trowbridge | 1965 |
| Airsprung Group PLC | Leeds | 1976 |
| Airsprung Limited | Wiltshire | 1978 |
| Airsprung Property Limited | Wiltshire | 1982 |
| Airsprung Scotland Limited | Falkirk | 1979 |
| Airssociates Consulting Limited | Southampton | 2017 |
| Airstars Consulting Limited | London | 2024 |
| Airstream Capital Limited | London | 2020 |
| Airstream Design Consultancy Limited | Hassocks | 2019 |
| Airstream Photo Booth Limited | High Peak | 2022 |
| Airsys Integrated Solutions (International) Limited | Edinburgh | 2021 |
| Airtec Engineering Limited | Solihull | 2012 |
| Airtech Analysis Ltd | Chelmsford | 1990 |
| Airtech Commissioning Limited | Birmingham | 1998 |
| Airtech Controls Limited | Birmingham | 1996 |
| Airtech Images Limited | Wolverhampton | 2017 |
| Airtech Refrigeration Limited | Northampton | 2021 |
| Airtech Solutions Ltd | Kirkcaldy | 2024 |
| Airteck Services Limited | Dudley | 2021 |
| Airtek Surveys Ltd | Croydon | 2020 |
| Airtemps Building Services Limited | London | 2020 |
| Airteq Limited | Leicester | 2013 |
| Airtest Ltd | Cannock | 2016 |
| Airth Ltd | Ruislip, | 2025 |
| Airthrey Accounting Limited | London | 2026 |
| Airtickets Ltd | London | 2010 |
| Airtight & Noisecheck Limited | Worlds End | 2006 |
| Airtight Accountancy Ltd | Guildford | 2017 |
| Airtight Building Solutions Ltd | Harrow | 2013 |
| Airtight Consultancy Limited | York | 2003 |
| Airtight Media Ltd. | Bristol | 2021 |
| Airtightness Testing (UK) Ltd | Wickford | 2007 |
| Airtik Limited | London | 2022 |
| Airtily Ltd | Edinburgh | 2020 |
| Airtime Communications (Cheshire) Limited | Cheshire | 2003 |
| Airtime Media Ltd | London | 2020 |
| Airtrax Engineering Ltd | Manningtree | 2015 |
| Airtread Ltd | Crumlin | 2026 |
| Airtronic Solutions Ltd | Bicester | 2014 |
| Airtronix Environmental Design Limited | Leeds | 2023 |