| 1 | PY | Surinam Airways Ltd. | ICAO: SLM, Callsign: Surinam, IATA Prefix: 192, | SME | AVCODES |
| 2 | PYA | Pouya Air Lines | Callsign: Pouya Air Lines, IATA designator PY* recallled. | IR | AVCODES |
| 3 | PYA | Pittsburgh, Youngstown & Ashtabula Railroad | | USA | TRAFFIC |
| 4 | PYAT | PRO-SAFE FIRE TRAINING SYSTEMS INC | | | SCAC4 |
| 5 | PYAU | POLISH YACHTING ASSOCIATION | | | SCAC4 |
| 6 | PYC | Aeropycsa, S.A. de C.V. | Callsign: Aeropycsa, | MEX | AVCODES |
| 7 | PYC | Aeropycsa | | | ICAO1 |
| 8 | PYCA | PUERTAS Y CONTROLES JONAISLI SA DE | | | SCAC4 |
| 9 | PYCN | PURITY COMPANIA NAVIERA SA | | | SCAC3 |
| 10 | PYCN | PLAYCON RECREATION INC | | | SCAC4 |
| 11 | PYCO | PETTYCO EXPRESS | | | SCAC4 |
| 12 | PYDI | PYRAMID TRANSPORT INC | | | SCAC4 |
| 13 | PYDN | PYRAMID TRANSPORTATION | | | SCAC3 |
| 14 | PYDR | PYRAMID TRANSPORT INC | | | SCAC4 |
| 15 | PYDT | PAYNES DUMP TRUCK SERVICE | | | SCAC3 |
| 16 | PYDY | PYRO-DYNE CORPORATION | | | SCAC3 |
| 17 | PYEC | PONY EXPRESS INC | | | SCAC4 |
| 18 | PYED | PAYTON, EUGENE DENNY | | | SCAC3 |
| 19 | PYEI | PYRAMID EXPRESS INC | | | SCAC4 |
| 20 | PYEN | PRODIGY ENTERPRISES INC | | | SCAC4 |
| 21 | PYEQ | PRESSEY ENTERPRISES INC | | | SCAC4 |
| 22 | PYER | PAYER OIL CO INC | | | SCAC4 |
| 23 | PYET | PAYETTE, GILLES | | | SCAC4 |
| 24 | PYEV | PEONYS ENVY | | | SCAC4 |
| 25 | PYFE | PENNYS FOR LESS EXPRESS | | | SCAC4 |
| 26 | PYFI | PYROFAX INTERNATIONAL | | | SCAC3 |
| 27 | PYFS | PRIORITY FREIGHT SYSTEMS INC | | | SCAC4 |
| 28 | PYFX | Petrolane Gas Service Limited Partnership | added 7/1987; eliminated 7/1990 | | NAKINA |
| 29 | PYFX | Petrolane Gas Service, Inc. | added 1/1985; eliminated 7/1987 | | NAKINA |
| 30 | PYFX | Pyrofax Gas Corp. | added 7/1963; 7/1965-1/1980; eliminated 1/1985 | | NAKINA |
| 31 | PYFX | Pyrofax Gas Corp. | 7/65-1/80; eliminated 1/85 | | NRHS |
| 32 | PYFX | Petrolane Gas Service, Inc. | added 1/85; eliminated 7/87 | | NRHS |
| 33 | PYFX | Petrolane Gas Service Limited Partnership | added 7/87; eliminated 7/90 | | NRHS |
| 34 | PYFX | PETROLANE GAS SERVICE INC. | | | PWRC |
| 35 | PYFX | PYROFAX GAS CORP | | | SCAC3 |
| 36 | PYGL | PAYNE, GARLAND L | | | SCAC4 |
| 37 | PYHA | PURYEAR, HAROLD A TRUCKING CO | | | SCAC4 |
| 38 | PYHH | PYRAMID HEAVY HAULERS INC | | | SCAC3 |
| 39 | PYHN | PANCHYSHYN | | | SCAC4 |
| 40 | PYHO | PERRY MOVING SERVICES LLC | | | SCAC4 |
| 41 | PYHS | PO YAN HU SHIPPING CO LTD | | | SCAC3 |
| 42 | PYHS | PREMIER TOUCHLESS DRYING SYSTEMS IN | | | SCAC4 |
| 43 | PYHU | PISCINAS 7 ISLAS SLU | | E | BIC |
| 44 | PYHU | PISCINAS Y HORMIGONES SEVEN (7) ISL | | | SCAC4 |
| 45 | PYHW | PYRSOS SHIPPING CO LTD | | | SCAC4 |
| 46 | PYIQ | PYRAMID VAN & STORAGE CO | | | SCAC3 |
| 47 | PYIQ | PLANES MOVING & STORAGE OF DAYTON I | | | SCAC4 |
| 48 | PYJN | PAYNE, JOHN | | | SCAC3 |
| 49 | PYKL | PARSEKYAN, MIKAYEL TRUCKING | | | SCAC3 |
| 50 | PYKS | PRYERS TRUCK SERVICE LLC | | | SCAC4 |
| 51 | PYL | Aerolap Paraguay Airlines | Believed to have never started operations. | PY | AVCODES |
| 52 | PYLA | PYLE AUTOMOTIVE & WRECKER SERVICE | | | SCAC3 |
| 53 | PYLA | PAYLESS AUTO TOWING LTD | | | SCAC4 |
| 54 | PYLB | PONY LOGISTICS LLC | | | SCAC4 |
| 55 | PYLC | PAYLESS GROUP INC | | | SCAC4 |
| 56 | PYLD | PAYNE, LLOYD LTD | | | SCAC4 |
| 57 | PYLE | PYLE, A. DUIE, INC | | | SCAC3 |
| 58 | PYLE | PYLE, A DUIE, INC | | | SCAC4 |
| 59 | PYLQ | PYLES TRUCKING CO | | | SCAC3 |
| 60 | PYLQ | PYLES TRUCKING CO INC | | | SCAC4 |
| 61 | PYLR | PYLE TRANSPORT SERVICES, INC | | | SCAC3 |
| 62 | PYLR | PYLE TRANSPORT SERVICES INC | | | SCAC4 |
| 63 | PYLS | PAY LESS OIL LLC | | | SCAC4 |
| 64 | PYLT | PERRY, LEE TRUCKING | | | SCAC3 |
| 65 | PYLT | PAYLOAD LOGISTICS INC | | | SCAC4 |
| 66 | PYLV | PRIORITY LOGISTIC SERVICES INC | | | SCAC4 |
| 67 | PYMC | PYRAMID CONTAINER LINE | | | SCAC4 |
| 68 | PYMD | PYRAMID SHIPPING INC | | | SCAC3 |
| 69 | PYMD | PYRAMID TRANSPORT INC | | | SCAC4 |
| 70 | PYMQ | PAY-LESS MOTORS CO | | | SCAC3 |
| 71 | PYN | Haverfordwest Air Charter Services Ltd. t/a fly wales | Callsign: Poyston, | GB | AVCODES |
| 72 | PYN | Haverfordwest Air Charter Services | | | ICAO1 |
| 73 | PYNC | PAYNE, JOHN C | | | SCAC3 |
| 74 | PYNC | PAYAN EXPRESS TRANSPORTATION SERVIC | | | SCAC4 |
| 75 | PYNI | PYNE FREIGHT LINES INC | | | SCAC3 |
| 76 | PYNI | PYNE FREIGHT LINES INC | | | SCAC4 |
| 77 | PYNJ | PAYNE, JERALD & ELISABETH & SONS IN | | | SCAC3 |
| 78 | PYNJ | PRIMARY CARRIERS | | | SCAC4 |
| 79 | PYNK | PAYNE TRUCKING | | | SCAC3 |
| 80 | PYNL | PAYNE, LEONARD | | | SCAC3 |
| 81 | PYNM | PAYNE MANUFACTURING CO | | | SCAC3 |
| 82 | PYNM | PROTEGE DELIVERY INC | | | SCAC4 |
| 83 | PYNO | PAYNE OIL INC | | | SCAC4 |
| 84 | PYNQ | PAYNE, KEITH L | | | SCAC3 |
| 85 | PYNR | PAYNE TRANSPORTATION SERVICES INC | | | SCAC3 |
| 86 | PYNR | PINKNEY TRANSPORTATION | | | SCAC4 |
| 87 | PYNS | PAYNES INC | | | SCAC3 |
| 88 | PYNS | PATTON TRUCKING COMPANY | | | SCAC4 |
| 89 | PYNT | PAYNE ALLIED TRUCKING | | | SCAC3 |
| 90 | PYNV | PYRAMID NAVIGATION E S A | | | SCAC3 |
| 91 | PYOC | PYRAMID OIL COMPANY | | | SCAC3 |
| 92 | PYOC | PHYSICIAN SALES & SERVICE INC | | | SCAC4 |
| 93 | PYOE | PRIORITY ONE (1) | | | SCAC4 |
| 94 | PYOI | PRIORITY-ONE COURIER INC | | | SCAC3 |
| 95 | PYOO | PARRISH OIL COMPANY | | | SCAC4 |
| 96 | PYOV | POLYANTHUS OVERSEAS INC | | | SCAC3 |
| 97 | PYOY | PERRY OIL COMPANY INC | | | SCAC4 |
| 98 | PYPO | PENLEY, PAUL OIL CO INC | | | SCAC4 |
| 99 | PYR | Pyramid Air Lines | IATA: UX, Callsign: Pyair, Designator UX recalled by IATA. | ET | AVCODES |
| 100 | PYR | Pyramid Air Lines | Callsign: Pyair, Designator UX recalled by IATA. | ET | AVCODES |
