| Company | Search On | Records | Category | Sub category |
| Cable And Wireless Ltd | CableAndWireless | 60 | Avionics | Wireless |
| Caddey (Coachbuilders) Ltd | Caddey | 1 | Ground Equipment | Ground Handling |
| Cadmium Nickel Batteries Ltd | CadmiumNickel | 8 | Airfields | Power Supply |
| Caledonian Airways | Caledonian | 2 | Air Transport | Airlines |
| Callender's Cable & Contruction Co Ltd | CallenderHamilton | 2 | Structures | Hangars |
| Caltex | Caltex | 1 | Lubricant Suppliers | |
| Calthrop Aerial Patents Ltd. E.R. | Calthrop | 40 | Survival Equipment | Parachutes |
| Cambrian Airways | Cambrian | 6 | Air Transport | Airlines |
| Cambridge School Of Flying & Aerodrome Co Ltd | Cambridge | 13 | Training | Flying School |
| Cambridge Scientific Instrument Co Ltd | CambridgeScientific | 7 | Testing | Measuring Equipment |
| Camden Construction Co Ltd. The | CamdenConstruction | 1 | Components | Wood |
| Camden Engineering Company Ltd. The | CamdenEngineering | 3 | Aeronautical Engineers | |
| Camelinat & Co Ltd. E. | Camelinat | 1 | Manufacturing | Coppersmiths |
| Camera Cuss | CameraCuss | 4 | Instrument Manufacturers | Clocks |
| Camloc Fastener GMBH | Camloc | 4 | Components | Cable Clamps |
| Campbell Aircraft Ltd | Campbell | 6 | Aircraft Manufacturers | Autogyro |
| Chantiers Aero Maritime de la Seine |
Cams | 3 | Aircraft Manufacturers | Non UK |
| Canadair Ltd | Canadair | 124 | Aircraft Manufacturers | Non UK |
| Canadian-American Machinery Co Ltd. The | CanadianAmerican | 1 | Engineering Equipment | Machine Tools |
| Canadian Pacific Air Lines | CanadianPacific | 3 | Air Transport | Airlines |
| Canadian Car & Foundry Company Ltd | CanCar | 2 | Aircraft Manufacturers | |
| Cannon Electric (Great Britain) Ltd | Cannon | 29 | Components | Electrical |
| Carbic Ltd | Carbic | 3 | Engineering Equipment | Welding |
| Carden Aero Engines | Carden | 10 | Engine Manufacturers | |
| Cardiff Aerodrome | Cardiff | 2 | Airfields | Airfield Operators |
| Cardiff Foundry & Engineering Co Ltd | CardiffFoundry | 4 | Airfields | Lighting |
| Cargo Aids Ltd | CargoAids | 6 | Role Equipment | Tie Downs |
| Carbonisation Ltd. Low Temperature (Coalene) | CarlessCapel | 2 | Fuel Suppliers | |
| Carleton MFG Co Ltd. The | CarletonMFG | 1 | Manufacturing | AGS |
| Carlisle Municipal Aerodrome | Carlisle | 2 | Airfields | |
| Carlux Electrical Services Ltd | Carlux | 1 | Factory | Electrical |
| Carmichael & Sons (Worcester) Ltd | Carmichael | 1 | Emergency Vehicles | Fire Appliances |
| Carr Fastener Co Ltd .(DOT) | CarrFastener | 30 | Fasteners | Aircraft |
| CASA. Construcciones Aeronauticas S.A. | CASA | 10 | Aircraft Manufacturers | Non UK |
| Cascade Water Coolers Ltd | Cascade | 1 | Factory | Water Coolers |
| Case Development Co Ltd | CaseDevelopment | 5 | Engineering Equipment | Machine Tools |
| Casein Ltd | Casein | 2 | Chemicals | Adhesives |
| Cashmore Bros | CashmoreBros | 4 | Fasteners | AGS |
| Castrol. C.C.Wakefield and Co Ltd | Castrol | 599 | Lubricant Suppliers | |
| Civil Air Transport |
CAT | 1 | Air Transport | Airlines |
| Catalin Ltd | Catalin | 1 | Materials | Plastics |
| Cathodeon Ltd | Cathodeon | 14 | Components | Fire Safety |
| Caudron Co Ltd. British | Caudron | 24 | Aircraft Manufacturers | Constructors |
| CEAG Ltd | CEAG | 3 | Components | Lighting |
| Cedos Engineering Co | Cedos | 1 | Manufacturing | Machining |
| CEE-BEE Chemical Company Ltd | CEEBEE | 1 | Chemicals | Anti Corrosion |
| C.E. Harper Aircraft Co | CEHarper | 1 | Aircraft Suppliers | Aircraft Sales |
| Celanese Ltd. British | Celanese | 19 | Finishes | Dope |
| Cellactite & British Uralite Ltd | Cellactite | 15 | Structures | Hangars |
| Cellon Richmond Ltd | Cellon | 452 | Finishes | Dope |
| C.E.Matthews & Co Ltd | CEMatthews | 1 | Materials | Fabric |
| Cementation (Muffelite) Ltd | Cementation | 7 | Materials | Insulation |
| Central Aeronautical Bureau Ltd | CentralAeronauticalBuro | 2 | Finishes | Paints |
| Central Aircraft Company | CentralAircraft | 15 | Training | Flying School |
| Central Novelty Co | CentralNovelty | 13 | Models | Flying |
| Cessna | Cessna | 186 | Aircraft Manufacturers | Non UK |
| CFM International | CFM | 17 | Engine Manufacturers | Non UK |
| C.F.Taylor (Metal Workers) Ltd | CFTaylor | 32 | Manufacturing | Sheet Metal Work |
| C.G. Carlisle & Co Ltd | CGCarlisle | 27 | Materials | Steel |
| C.G.Spencer & Sons | CGSpencer | 29 | Aircraft Manufacturers | |
| Chamberlain Industries Ltd | ChamberlainIndustries | 9 | Services | Hangars |
| Chamberlain Manufacturing Corporation | ChamberlainManufacturing | 1 | Ground Equipment | |
| Champion Spark Plugs | Champion | 3 | Components | Spark Plugs |
| Chance Brothers Ltd | Chance | 21 | Airfields | Lighting |
| Chandler-Evans Corporation | ChandlerEvans | 18 | Components | Carburetters |
| Channel Airways | Channel | 3 | Air Transport | Airlines |
| Channel Air Bridge Ltd | ChannelAirBridge | 1 | Air Transport | Airlines |
| Chantry's Aircraft Sheet Metalwork | Chantry | 1 | Manufacturing | Sheet Metal Work |
| Charles Boss & Co (Liverpool) Ltd | CharlesBoss | 3 | Materials | Wood |
| Charles Butterfield Ltd | CharlesButterfield | 1 | Manufacturing | Chains |
| Charles Clifford & Son Ltd | CharlesClifford | 16 | Materials | Bronze |
| Charles Frank | CharlesFrank | 1 | Instrument Manufacturers | |
| Charles Hatton & Co | CharlesHatton | 1 | Materials | Metals |
| Charles D.Holmes & Co Ltd | CharlesHolmes | 1 | Manufacturing | General Engineering |
| Charles Lane & Co Ltd | CharlesLane | 1 | Components | Propellers |
| Charles Weston & Co Ltd | CharlesWeston | 26 | Components | Seals |
| Chas Bunn Ltd | ChasBunn | 1 | Manufacturing | Rolled Sections |
| Chater Lea | ChaterLea | 8 | Engineering Equipment | Hand Tools |
| Chauviere. L. (Propellers) | Chauviere | 10 | Components | Propellers |
| Chelsea Aviation Company Ltd | ChelseaAviation | 1 | Manufacturing | Components |
| Chelsea Precision Tools. Messrs | ChelseaPrecision | 1 | Manufacturing | Machine Tools |
| Chelton (Electrostatics) Ltd | Chelton | 12 | Avionics | Radio |
| Cheney Connect | Cheney | 1 | Consumables | AGS |
| Cherry Buck | CherryBuck | 2 | Components | Fasteners |
| Chester Engineering Co (1910) Ltd | ChesterEngineering | 1 | Maintenance | AGS |
| Chesterfield Tube Co Ltd | ChesterfieldTube | 6 | Manufacturing | Tubing |
| Chevron International Oil Company | Chevron | 14 | Fuel Suppliers | |
| C.H.Holmes & Son | CHHolmes | 8 | Materials | Leather |
| Chilton Aircraft | Chilton | 26 | Aircraft Manufacturers | |
| Chinn & Co Ltd. J.S. | Chinn | 1 | Manufacturing | Sheet Metal Work |
| Chiswell Wire Co Ltd | ChiswellWire | 3 | Components | Springs |
| C.H.Johnson & Sons Ltd | CHJohnson | 3 | Ground Equipment | Compressors |
| C.H.Joyce Ltd | CHJoyce | 1 | Engineering Equipment | Machine Tools |
| Chobert. Aviation Developments Ltd | Chobert | 53 | Engineering Equipment | Riveting Machinery |
| Chrislea Aircraft Company Ltd. The | Chrislea | 11 | Aircraft Manufacturers | |
| Christie-Tyler Ltd | ChristieTyler | 1 | Role Equipment | Interiors |
| CIBA (ARL) Ltd | CIBA | 13 | Materials | Adhesives |
| Cincinnati Milling Machines Ltd | Cincinnati | 1 | Engineering Equipment | Machinery |
| Cinque Ports Flying Club | CinquePorts | 67 | Training | Flying School |
| Cintel Ltd. Rank | Cintel | 9 | Avionics | Navigation |
| Cirrus Hermes Engineering Co Ltd | Cirrus | 333 | Engine Manufacturers | |
| City Sheet Metal Works Ltd | CitySheetMetal | 3 | Fabrication | Sheet Metal Work |
| Civilian Aircraft Co | Civilian | 7 | Aircraft Manufacturers | |
| C.J.C.Developments (Portsmouth) Ltd | CJC | 4 | Manufacturing | Machining |
| C.J.Fox & Sons | CJFox | 20 | Fasteners | AGS |
| Clabour, Westbay & Co. W.A. | ClabourWestbay | 1 | Fasteners | AGS |
| Clancey & Brown | ClanceyBrown | 2 | Manufacturing | Precision Engineering |
| Clare-Elliott Ltd | Clare-Elliott | 1 | Components | Electrical |
| Clark Cluley | ClarkCluley | 6 | Fabrication | Precision Engineering |
| Clarke Aircraft Products | ClarkeAircraftProducts | 2 | Manufacturing | Engineering |
| Clarke Chapman & Company Limited | ClarkeChapman | 8 | Airfields | Lighting |
| Clarkes Ltd | ClarkesLtd | 1 | Components | Springs |
| Clarkson (Engineers) Ltd | Clarkson | 1 | Engineering Equipment | Machine Tools |
| Claude Lyons Ltd | ClaudeLyons | 5 | Testing | Test Equipment |
| Claude Rye Bearings | ClaudeRye | 1 | Components | Bearings |
| Clayton-Wright Ltd. Howard | ClaytonWright | 3 | Manufacturing | AGS |
| Cleveland Bridge & Engineering Co Ltd |
ClevelandBridge |
3 | Structures | Hangars |
| Cleveland Discol | ClevelandDiscol | 6 | Fuel Suppliers | |
| Cleveland Pneumatic Tool Co. The | ClevelandPneumatic | 1 | Components | Pneumatics |
| C & L Hill Ltd | CLHill | 4 | Engineering Equipment | Machine Tools |
| Clifford & Co Ltd. Peter S. | Clifford | 5 | Aircraft Suppliers | Distributors |
| Clifford Products Ltd | CliffordProducts | 2 | Manufacturing | Fabrications |
| Clift. E.H. | Clift | 10 | Pilot Supplies | Maps |
| C.Lindley & Co Ltd | CLindley | 3 | Manufacturing | AGS |
| Clothing. Flying, Uniforms & Protective | Clothing | 83 | Clothing | Uniforms |
| Clyde Aircraft | Clyde | 34 | Aircraft Manufacturers | Non UK |
| Clyde Hover Ferries Ltd | ClydeHover | 1 | Aircraft Manufacturers | Hovercraft |
| C.M.A.Airlines | CMA | 1 | Air Transport | Airlines |
| C & N Electrical Ltd | CNElectrical | 6 | Components | Electrical |
| Coan Ltd. Robert W | Coan | 44 | Fabrication | Castings |
| Cochrane & Co | CochraneCo | 23 | Engine Manufacturers | |
| Cochrane Propeller Company Co. The | CochranePropeller | 8 | Manufacturing | Propellers |
| Cody Flying School | Cody | 5 | Training | Flying School |
| C.O.H.Baines Ltd | COHBaines | 7 | Manufacturing | Rubber |
| Colas Products Ltd | Colas | 4 | Airfields | Construction |
| Cole & Sons Ltd. W. | Cole | 25 | Aircraft Parts | Airframe |
| Coley & Atkinson | ColeyAtkinson | 2 | Distributors | |
| College Of Aeronautical Engineering | CollegeAeroEng | 5 | Training | Classroom |
| Colleges | Colleges | 74 | Training | Classroom |
| Collier, Toolmaker. | CollierToolmaker | 1 | Manufacturing | Machine Tools |
| Collins Radio Company | Collins | 75 | Avionics | Radar |
| Colnbrook Instrument Development Ltd | ColnbrookInstrument | 3 | Manufacturing | Gyroscopes |
| Colour Sprays Ltd |
ColourSprays |
2 | | |
| Columbia Ribbon & Carbon Mnfg Co Ltd | ColumbiaRibbon | 2 | Office Equipment | Duplicating Machines |
| Combined Metals & Reinforced Casting Co Ltd. The | CombinedMetals | 7 | Manufacturing | Aluminium Alloys |
| Commercial Air Hire Ltd | CommercialAir | 4 | Air Transport | Aircraft Hire |
| Commercial Structures Ltd | CommercialStructures | 18 | Factory | Construction |
| Commercial X-Rays Ltd | CommercialXRays | 1 | Engineering Equipment | NDT |
| Comoy & Co Ltd. H. | Comoy | 2 | Materials | Laminated Fabrics |
| Comper Aircraft Co Ltd | Comper | 54 | Aircraft Manufacturers | |
| Berling Magneto | Components | 7 | Components | Magnetos |
| Computing Devices Of Canada Ltd | ComputingDevices | 5 | Avionics | Navigation |
| Comyn Ching & Co Ltd | ComynChing | 2 | Factory | Air Conditioning |
| Conder Eng Co Ltd | Conder | 1 | Structures | Hangars |
| Connolly Bros (Curriers) Ltd | ConnollyBros | 23 | Materials | Leather |
| Consolidated Aircraft | Consolidated | 6 | Aircraft Manufacturers | Non UK |
| Consolidated Pneumatic Tool Co Ltd | ConsolidatedPneumatic | 3 | Engineering Equipment | Hand Tools |
| Constant Speed Airscrews Ltd | ConstantSpeed | 14 | Components | Propellers |
| Constructors Ltd | Constructors | 12 | Factory | Shelters |
| Mortimer & Vaughan | Consultancy | 1 | Aviation | Consultancy |
| Continental Tyre & Rubber Company (Grt Brit) Ltd | Continental | 31 | Materials | Rubber |
| Continental Motors Corporation | ContinentalMotors | 15 | Engine Manufacturers | Non UK |
| Controlled Heat & Air Ltd | ControlledHeat | 1 | Engineering Equipment | Heaters |
| General Dynamics Corporation | Convair | 10 | Aircraft Manufacturers | Non UK |
| Conveyancer Fork Trucks Ltd | Conveyancer | 1 | Ground Equipment | Ground Handling |
| Cookson & Clegg Ltd | CooksonClegg | 3 | Clothing | Flying Clothing |
| Coopers Mechanical Joints Ltd | CoopersJoints | 13 | Components | Seals |
| Cooper, Webb-Jones & Co | CooperWebb | 1 | Manufacturing | Windscreens |
| Corfield And Buckle Ltd | CorfieldBuckle | 15 | Fabrication | Sheet Metal Work |
| Cornercroft Ltd | Cornercroft | 51 | Fabrication | Sheet Metal Work |
| Corrugated Packing & Sheet Metal Co Ltd. The | CorrugatedPacking | 2 | Components | Gaskets |
| Cory Brothers & Company Ltd | CoryBrothers | 30 | Engineering Equipment | Hand Tools |
| Coseley Engineering Co Ltd | CoseleyEngineering | 2 | Structures | Hangars |
| Cosmos Engineering Co Ltd | Cosmos | 8 | Engine Manufacturers | |
| Cossor Ltd. A.C. | Cossor | 66 | Avionics | Navigation |
| Costain Ltd | Costain | 5 | Airfields | Construction |
| Counting Instruments Ltd | CountingInstruments | 16 | Engineering Equipment | Measuring Equipment |
| Courtney Pope Aircraft Ltd | CourtneyPope | 1 | Fasteners | AGS |
| Coventry Aviation Company | CoventryAviation | 1 | Manufacturing | AGS |
| Coventry Chain Co | CoventryChain | 14 | Fasteners | Studs |
| Coventry Climax Engines Ltd | CoventryClimax | 15 | Engine Manufacturers | |
| Coventry Controls Ltd | CoventryControls | 1 | Components | Electrical |
| Coventry Gauge & Tool Co | CoventryGauge | 1 | Engineering Equipment | Machinery |
| Coventry Ordnance Works | CoventryOrdnance | 1 | Aircraft Manufacturers | |
| Coventry Premier Ltd | CoventryPremier | 2 | Manufacturing | Components |
| Coventry Radiator & Presswork Co Ltd | CoventryRadiator | 1 | Components | Radiators |
| Coventry Victor Motor Company Ltd | CoventryVictor | 29 | Engine Manufacturers | Stationary Engines |
| CMD Engineering Co Ltd | Covmo | 5 | Components | Piston Rings |
| Cowey Engineering Co Ltd. The | CoweyEng | 1 | Components | Fuel Systems |
| Cowley & Co Ltd. H.W. | Cowley | 3 | Engine Manufacturers | |
| Cowper-Coles Manufacturing Co | CowperColes | 3 | Finishes | Galvanising |
| Cowper Penfold & Co Ltd | CowperPenfold | 1 | Components | Heaters |
| Cox & Co | Cox | 3 | Manufacturing | Tubing |
| C.P.Clare Ltd | CPClare | 4 | Components | Electrical |
| Craddock & Co Ltd. George | Cradock | 16 | Fabrication | Wire |
| Cramic Engineering Co Ltd | Cramic | 7 | Engineering Equipment | Machine Tools |
| Crane Packing Of Slough England | CranePacking | 1 | Chemicals | PTFE |
| Cranes (Birningham) Ltd | CranesBirm | 1 | Manufacturing | Castings |
| Crawley Industrial Products Ltd | CrawleyIndustrial | 4 | Engineering Equipment | Jigs |
| Cremer Lamp & Engineering Co Ltd. The | CremerLamp | 1 | Manufacturing | Components |
| C.R.Garrad Ltd | CRGarrad | 1 | Components | Bearings |
| C.R.Hopkins | CRHopkins | 1 | Components | Heaters |
| Crilly Airways Ltd | Crilly | 1 | Air Transport | Airlines |
| Crittall Steel Furniture Co Ltd | Crittall | 2 | Factory | Storage |
| Croda Ltd | Croda | 1 | Chemicals | Anti Corrosion |
| CROID. Improved Liquid Glues Co Ltd | Croid | 22 | Materials | Adhesives |
| Crolt Engineering Ltd. The | CroltEngineering | 1 | Engineering Equipment | Jigs |
| Crompton Parkinson | Crompton | 1 | Components | Electrical |
| Cross MFG (1938) Ltd | CrossMFG | 37 | Components | AGS |
| Crossville Motor Co Ltd | Crossville | 3 | Aircraft Manufacturers | |
| Croydon Air Port | Croydon | 3 | Aircraft Suppliers | Aircraft Sales |
| Croydon Air Services | CroydonAirServices | 1 | Maintenance | Aircraft |
| Croydon Engineering Co Ltd | CroydonEngineering | 27 | Components | Electrical |
| C.R.Tipping & Co Ltd | CRTipping | 2 | Engineering Equipment | Hand Tools |
| Crypton Equipment Ltd | Crypton | 2 | Ground Equipment | Ground Power Units |
| CSE Aviation Ltd | CSE | 164 | Aircraft Suppliers | Distributors |
| Compagnie Generale De Telgraphic Sans Fil | CSF | 6 | Avionics | Radar |
| Cunard Eagle Airways | CunardEagle | 8 | Air Transport | Airlines |
| Cunliffe Owen | CunliffeOwen | 70 | Aircraft Manufacturers | |
| Curd Components Ltd | Curd | 14 | Fasteners | AGS |
| Curran Ltd. John | Curran | 46 | Engineering Equipment | Test Equipment |
| Curtiss Motor Co | Curtiss | 46 | Aircraft Manufacturers | Non UK |
| Curtiss Wright Corporation Airplane Division | CurtissWright | 49 | Aircraft Manufacturers | Non UK |
| C.W.Aircraft | CWAircraft | 7 | Aircraft Manufacturers | |
| C.W.C Equipment Ltd | CWC | 25 | Manufacturing | Electrical |
| C.W. Fletcher & Sons Ltd | CWFletcher | 7 | Manufacturing | Sheet Metal Work |
| Cyclone Welding Plant Co. The | CycloneWelding | 1 | Engineering Equipment | Welding |
| Cyprus Airways | CyprusAirways | 1 | Air Transport | Airlines |
| Czechoslovak Automobile & Aircraft Works | CZ | 1 | Aircraft Manufacturers | Non UK |
| Czechoslovak Airlines | CzechoslovakAirlines | 1 | Air Transport | Airlines |
