| 1 | AMP | Aero Transporte S.A. (ATSA) | IATA: 4A, Callsign: Atsa, IATA Prefix: 212, | PE | AVCODES |
| 2 | AMP | Aero Transporte S.A. (ATSA) | | | ICAO1 |
| 3 | AMP | AMP Bahnlogistik GmbH | Großenlupnitz (AMP = Adam, Müller, Pfotenhauer) | D | privat-bahn.de |
| 4 | AMP | AMP Bahnlogistik | | DE | VKM |
| 5 | AMPB | AMERICAN PIGGYBACK INC | | | SCAC3 |
| 6 | AMPC | AMERICAN PACIFIC CONTAINER LINE INC | | | SCAC3 |
| 7 | AMPC | AMERICAN PACIFIC CONTAINER LINE INC | | | SCAC4 |
| 8 | AMPD | ALLIED MINERAL PRODUCTS INC | | | SCAC3 |
| 9 | AMPD | AM-MEX PRODUCTOS INT S DE R L DE C | | | SCAC4 |
| 10 | AMPE | ARTS METAL PROCESSING | | | SCAC4 |
| 11 | AMPEX | Ampex | City: Bytom | PL | TRAFFIC |
| 12 | AMPF | AMERICAN PACIFIC FORWARDERS | | | SCAC3 |
| 13 | AMPF | AMERICAN PACIFIC FORWARDERS INC | | | SCAC4 |
| 14 | AMPG | AMERICAN PARCEL SERVICE OF GEORGIA | | | SCAC3 |
| 15 | AMPH | ACE MANUFACTURING & PARTS CO | | | SCAC3 |
| 16 | AMPH | AMPHENOLOPTIMIZE MEX SA DE CV | | | SCAC4 |
| 17 | AMPI | AMERICAN PRIORITY ENTERPRISES INC | | | SCAC3 |
| 18 | AMPI | A M PYROTECHNICS LLC | | | SCAC4 |
| 19 | AMPJ | AM-PM DELIVERY SERVICE INC | | | SCAC3 |
| 20 | AMPK | AMPERE TRUCKING | | | SCAC3 |
| 21 | AMPM | AM PM LOGISTIX | | | SCAC4 |
| 22 | AMPN | AMERICAN PACKING & SHIPPING INC | | | SCAC3 |
| 23 | AMPN | AMERICAN PACKING & SHIPPING INC | | | SCAC4 |
| 24 | AMPO | AMPOL TRUCKING COMPANY | | | SCAC3 |
| 25 | AMPP | A M P TRANSPORT | | | SCAC3 |
| 26 | AMPQ | A M P M SPECIAL DELIVERY INC | | | SCAC3 |
| 27 | AMPQ | AMAC IMPRESOS SA DE CV | | | SCAC4 |
| 28 | AMPR | AMERICAN PARCEL SERVICE INC | | | SCAC3 |
| 29 | AMPR | AMERICAN PETROLEUM CARRIERS LLC | | | SCAC4 |
| 30 | AMPR | Amprion GmbH | | DE | VKM |
| 31 | AMPS | AMP LLC | | | SCAC4 |
| 32 | AMPT | AMERICAN PETROLEUM COMPANY (OF TEXA | | | SCAC3 |
| 33 | AMPT | AM TRANSPORT LTD | | | SCAC4 |
| 34 | AMPU | AVISA MARITIME PTE LTD | | SGP | BIC |
| 35 | AMPV | A M/P M SERVICES INC | | | SCAC3 |
| 36 | AMPV | AMERICAN POULTRY SERVICES LTD | | | SCAC4 |
| 37 | AMPW | AMPAR WORLDWIDE FORWARDERS INC | | | SCAC3 |
| 38 | AMPW | ARAB MARITIME PETROLEUM TRANSPORT C | | | SCAC4 |
| 39 | AMPX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 40 | AMPX | General Electric Railcar Services Corp. | added 1/1984; 1/1985-1/1994; eliminated 1/2000 | | NAKINA |
| 41 | AMPX | North American Car Corp. | added 1/1977; 1/1980; eliminated 1/1984 | | NAKINA |
| 42 | AMPX | Ark-Mo Plant Food Co., Inc. | 1/1952-10/1957; eliminated 4/1958; added 7/1958; 4/1961-7/1965; eliminated 10/1965 | | NAKINA |
| 43 | AMPX | American Chemical Paint Co. | 7/1930-4/1938 | | NAKINA |
| 44 | AMPX | American Chemical Paint Co. | Apr-38 | | NRHS |
| 45 | AMPX | Ark-Mo Plant Food Co., Inc. | 1/52-10/57; added 7/58; 4/61-7/65; eliminated 10/65 | | NRHS |
| 46 | AMPX | North American Car Corp. | added 1/77; 1/80 | | NRHS |
| 47 | AMPX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 48 | AMPX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 49 | AMPX | *AMERICAN CHEMICAL PAINT CO. | | | PWRC |
| 50 | AMPX | *ARK-MO PLANT FOOD CO., INC. | | | PWRC |
| 51 | AMPX | +(NATX) G.E. RAIL SERVICES CORP. [NORTH AMERICAN CAR CORP.] (AMALGAMAIZE CO., LESSEE) | | | PWRC |
| 52 | AMPX | American Chemical Paint (GE Railcar Services Corporation) | | | RSRV |
| 53 | AMPX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 54 | AMPY | AMERICAN TRUCKING COMPANY | | | SCAC3 |
| 55 | AMPY | AMERICAN EXPRESS TRUCKING CO | | | SCAC4 |
| 56 | AMPZ | ADM PLANT | | | PWRC |
