| Company | Search On | Records | Category | Sub category |
| Page Engineering Compnay | Page | 9 | Components | Electronics |
| Painton & Co Ltd | Painton | 8 | Components | Electrical |
| Paint Removers Ltd | PaintRemovers | 6 | Chemicals | Paints |
| Pakistan International Airlines | Pakistan | 1 | Aerial Work | Airlines |
| PalmerTyre | 0 | | |
| Palmer Aero Products Ltd | PalmerAeroProd | 33 | Components | Systems |
| Panair Do Brasil | Panair | 2 | Air Transport | Airlines |
| Pan American World Airways | PanAm | 16 | Air Transport | Non UK |
| Panavia | Panavia | 28 | Aircraft Manufacturers | |
| Aeroplane Works Panda | Pander | 3 | Aircraft Manufacturers | Non UK |
| Richard Pape Ltd | Pape | 5 | Components | Lighting |
| Park Air Electronics | ParkAir | 3 | Communications | Radio |
| Parkinson & Cowan Ltd | ParkinsonCowan | 2 | Manufacturing | General Engineering |
| Parman Aircraft Supplies Ltd | Parman | 1 | Sales & Brokerage | Stockists |
| George Parnall and Co | Parnall | 79 | Aircraft Manufacturers | |
| Thos Parsons & Sons | Parsons | 24 | Finishes | Varnish |
| Partenavia Sp.A. | Partenavia | 5 | Aircraft Manufacturers | Non UK |
| Partridge Wilson & Co Ltd | PartridgeWilson | 5 | Ground Equipment | Ground Power Units |
| Vendair | PartsStockists | 3 | Sales & Brokerage | Spares Stockists |
| Patey & Co Ltd | Patey | 1 | Aircraft Manufacturers | |
| P B Cow And Co Ltd | PBCow | 19 | Materials | Rubber |
| P B Deviator Ltd | PBDeviator | 20 | Components | Controls |
| P.D.V. Aircraft Company Ltd | PDV | 1 | Aeronautical Engineers | |
| New Pegamoid Ltd | Pegamoid | 18 | Materials | Fabric |
| Pegasus Aircraft Co Ltd | Pegasus | 2 | Components | Propellers |
| Pegson Ltd | Pegson | 1 | Ground Equipment | Refuelling |
| Pemberton-Billing Ltd | PembertonBilling | 4 | Aircraft Manufacturers | |
| Penfold Fencing Ltd | Penfold | 3 | Structures | Fencing |
| Penny & Giles Ltd | PennyGiles | 9 | Components | Electrical |
| Peradin & Watercraft Ltd | PeradinWatercraft | 10 | Materials | Rubber |
| Percival Aircraft Ltd | Percival | 156 | Aircraft Manufacturers | |
| F Perkins Ltd | Perkins | 42 | Watercraft | Engines |
| P.E.R.L. (Lighting) Ltd | Perl | 1 | Airfields | Lighting |
| Permali Group | Permali | 1 | Manufacturing | Fibre Glass |
| Perry Aviation Co | Perry | 4 | Aircraft Manufacturers | Flying Boat |
| Perry Barr Metal Co Ltd | PerryBarr | 7 | Manufacturing | Castings |
| Perry Bevan & Co Ltd | PerryBevan | 1 | Manufacturing | Sheet Metal Work |
| Perry & Co Ltd | PerryChain | 3 | Components | Controls |
| Zam-Buk | Personal | 2 | Health And Safety | First Aid Kits |
| Personal Airways | PersonalAirways | 1 | Air Transport | Air Charter |
| Pertrix Ltd | Pertrix | 1 | Components | Batteries |
| Petbow Ltd | Petbow | 17 | Ground Equipment | Ground Power Units |
| Peto Scott Electrical Instruments Ltd | PetoScott | 1 | Airfields | Air Traffic Control |
| Petrie & McNaught Ltd | PetrieMcNaught | 1 | Factory | Logistics |
| Philco Radio & Television Corpn Ltd | Philco | 1 | Manufacturing | Machine Tools |
| Philips Lamps Ltd | Philips | 33 | Factory | Lighting |
| Phillips & Powis Aircraft (Reading) Ltd | PhillipsAndPowis | 40 | Distributors | Aircraft |
| Phoenix Dynamo Mfg Ltd | Phoenix | 2 | Aircraft Manufacturers | |
| The Phoenix Steel Tube Co Ltd | PhoenixTube | 1 | Materials | Tubing |
| Phosphor Bronze Co Ltd | PhosphorBronze | 4 | Manufacturing | Bushes |
| Piaggio Of Genoa | Piaggio | 106 | Aircraft Manufacturers | |
| Pickfords Ltd | Pickfords | 2 | Transport | Logistics |
| Sydney Pickles & Clifford Prodger | PicklesProdger | 4 | Aerial Work | Test Flying |
| Piggott Brothers & Co Ltd | PiggottBros | 13 | Structures | Hangars |
| Pilatus | Pilatus | 13 | Aircraft Manufacturers | Non UK |
| Pilkington PE Ltd | Pilkington | 3 | Materials | Transparencies |
| John B Pillin | Pillin | 6 | Engineering Equipment | Maintenance |
| Pinchin, Johnson & Co | PinchinJohnson | 17 | Finishes | Paints |
| Pioneer Instrument Company | PioneerInstrument | 15 | Instrument Manufacturers | Non UK |
| Pioneer Oilseals & Moulding Co Ltd | PioneerOilseals | 3 | Components | Seals |
| Pioneer Parachute Company Inc | PioneerParachute | 45 | Survival Equipment | Parachutes |
| Piper | Piper | 135 | Aircraft Manufacturers | Non UK |
| Societa Italiana Pirelli | Pirelli | 1 | Materials | Fabric |
| Sir Isaac Pitman & Sons Ltd | Pitman | 24 | Literature | Publishers |
| Pitter Gauge & Precision Tool Co Ltd | PitterGauge | 1 | Instrument Manufacturers | Test Equipment |
| Plannair Limited | Plannair | 35 | Components | Compressors |
| Plantation Wood Ltd | PlantationWood | 1 | Materials | Wood |
| Plastilume Products | Plastilume | 12 | Materials | Transparencies |
| Plessey Company Ltd | Plessey | 261 | Avionics | Wireless |
| J.G.Plumb & Son | Plumb | 4 | Clothing | Uniforms |
| Plus Gas Company Ltd | PlusGas | 8 | Chemicals | Anti-Corrosion |
| P.N.Stanley | PNStanley | 10 | Clothing | Flying Clothing |
| Pobjoy Airmotors Ltd | Pobjoy | 54 | Engine Manufacturers | |
| Polarcold Ltd | Polarcold | 1 | Fabrication | Sheet Metal Work |
| Polgrat-Development-Gesellschaft | Polgrat | 2 | Aircraft Manufacturers | Non UK |
| The Poole Aviation Co | PooleAviation | 1 | Aircraft Parts | Accessories |
| Portass & Son | Portass | 2 | Aircraft Manufacturers | |
| Porterfield | Porterfield | 6 | Aircraft Manufacturers | Non UK |
| Portholm Aerodrome | Portholm | 2 | Airfields | |
| Huntingdon RBC | Portholme | 1 | Airfields | |
| Portsmouth Airport | PortsmouthAirport | 6 | Airfields | Airfield Operators |
| Portsmouth Aviation Ltd | PortsmouthAviation | 36 | Maintenance | Contractors |
| Portway Forgings (Wednesbury) Ltd | PortwayForgings | 1 | Manufacturing | Forging |
| Potez | Potez | 7 | Aircraft Manufacturers | Non UK |
| Flying Flea | Pou | 29 | Aircraft Manufacturers | |
| PowerAuxiliaries Ltd | PowerAuxiliaries | 18 | Components | Piping |
| Power Controls Ltd | PowerControls | 4 | Components | Electrical |
| Power Flexible Tubing Co Ltd | PowerFlexible | 25 | Components | Hydraulics |
| Powerite Steam Jointing Co Ltd | Powerite | 1 | Chemicals | Adhesives |
| Power Jacks Ltd | PowerJacks | 22 | Ground Equipment | Jacks |
| Power Jets (Research & Development) Ltd | PowerJets | 1 | Manufacturing | Consultancy |
| The Power Plant Co Ltd | PowerPlant | 1 | Components | Gears |
| Powerplus (1927) Ltd | Powerplus | 1 | Components | Superchargers |
| Powers-Samas Accounting Machines Ltd | PowersSamas | 1 | Factory | Administration |
| David Powis & Sons Ltd | Powis | 19 | Fasteners | AGS |
| Czechoslovak Metal & Engineering Works | Praga | 1 | Aircraft Manufacturers | Non UK |
| Pratt & Whitney | PrattAndWhitney | 40 | Engine Manufacturers | Non UK |
| Anglo-American Oil Co Ltd | Pratts | 182 | Fuel Suppliers | |
| Precision Castings | PrecisionCastings | 4 | Manufacturing | Castings |
| Precision Diamond Products | PrecisionDiamond | 6 | Engineering Equipment | Machine Tools |
| Precision Engineering Products (Suffolk) Ltd | PrecisionEngineering | 2 | Ground Equipment | Ground Handling |
| Precision Grinding Ltd | PrecisionGrinding | 1 | Manufacturing | Grinding |
| Precision Products (Romford) Ltd | PrecisionProducts | 1 | Engineering Equipment | Jigs |
| Precision Rubbers Ltd | PrecisionRubbers | 17 | Materials | Rubber |
| Premier Aeroplane Manufacturing Co Ltd | PremierAeroplane | 1 | Aircraft Manufacturers | |
| Premier Electric Heaters Ltd | PremierElectric | 4 | Engineering Equipment | Heaters |
| Premier Oil Extracting Mills Ltd | PremierOil | 1 | Lubricant Suppliers | Castor Oil |
| Premier Precision Ltd | PremierPrecision | 4 | Manufacturing | Consultancy |
| The Premier Screw & Repetition Co Ltd | PremierScrew | 2 | Fasteners | Screws |
| Pressed Steel Company Ltd | PressedSteel | 22 | Engineering Equipment | Refrigeration |
| Prestolite International Corporation | Prestolite | 4 | Components | Cables |
| Preston Sheet Metal Co | PrestonSheetMetal | 1 | Manufacturing | Sheet Metal Work |
| Pritt & Co | Pritt | 2 | Aircraft Parts | Logistics |
| Procter Bros (Wireworks) Ltd | ProcterBros | 2 | Manufacturing | Wire |
| Proops Brothers Ltd | ProopsBros | 4 | Aircraft Parts | Navigation |
| Prosser & Sons | Prosser | 1 | Manufacturing | Woodworking |
| Prove Bros Ltd | ProveBros | 1 | Factory | Security |
| P.S.& I.O.W.A. Ltd | PSIOWA | 12 | Air Transport | Airlines |
| R B Pullin & Co Ltd | Pullin | 85 | Instrument Manufacturers | Maintenance |
| Pulsometer Engineering Co Ltd | Pulseometer | 16 | Components | Fuel Systems |
| Pulvo Engineering Co Ltd | Pulvo | 20 | Manufacturing | Components |
| Pump Unit Ltd | PumpUnit | 1 | Engineering Equipment | Pumps |
| Punfield & Barstow (Mouldings) Ltd | PunfieldBarstow | 1 | Manufacturing | Mouldings |
| Purdie Bros | PurdieBros | 1 | Manufacturing | Sheet Metal Work |
| Putney Foundry | PutneyFoundry | 2 | Manufacturing | Castings |
| P.W Greenwood Ltd | PWGreenwood | 15 | Aircraft Parts | Suppliers |
| Pye Ltd | Pye | 49 | Components | Electrical |
| Pyrene Company Ltd | Pyrene | 84 | Emergency Vehicles | Fire & Rescue |
| Pytram Ltd | Pytram | 3 | Materials | Cellulose |
| National Aircraft Factory | PZL | 6 | Aircraft Manufacturers | Non UK |
