| 1 | AMB | Deutsche Rettungsflugwacht | IATA: 1I, Callsign: Civil Air Ambulance, Name changed to DRF - Stiftung Luftrettung Gemeinnuetzige AG. Previously used IATA code DV | D | AVCODES |
| 2 | AMB | Deutsche Rettungsflugwacht | IATA: DV, Callsign: Air Ambulance, Designator DV recalled by IATA | D | AVCODES |
| 3 | AMB | Deutsche Rettungsflugwacht | IATA: 1I | | ICAO1 |
| 4 | AMB | AMERICAN BRIDGE | | | PWRC |
| 5 | AMBA | AMBASSADOR MARITIME INC | | | SCAC4 |
| 6 | AMBB | AMERITRANS CORPORATION | | | SCAC3 |
| 7 | AMBC | AMBUCAR SERVICE | | | SCAC3 |
| 8 | AMBC | AMSTELLAND SHIPPING B V | | | SCAC4 |
| 9 | AMBER | Anber Coaches | City: Rayleigh | GB | TRAFFIC |
| 10 | AMBF | AMERICAN BASIC TRANSPORT INC | | | SCAC3 |
| 11 | AMBF | ARMSTRONG RELOCATION CO (BROKERAGE | | | SCAC4 |
| 12 | AMBG | AMERICAN BARGE CARRIERS INC | | | SCAC3 |
| 13 | AMBI | AMAN BROS INC | | | SCAC3 |
| 14 | AMBJ | A-M BUS CO INC | | | SCAC3 |
| 15 | AMBJ | ARMENTA BOJORQUEZ, JESUS | | | SCAC4 |
| 16 | AMBL | ALIMENTOS BOLONIA | | | SCAC4 |
| 17 | AMBM | AMERICAN BONDED MOVING & STORAGE CO | | | SCAC3 |
| 18 | AMBN | AMSBERRY INC | | | SCAC3 |
| 19 | AMBN | AMSBERRY INC | | | SCAC4 |
| 20 | AMBO | AMBROSE TRUCKING | | | SCAC3 |
| 21 | AMBP | AMERICAS BEST INC | | | SCAC3 |
| 22 | AMBP | AMEY, B TRANSPORT | | | SCAC4 |
| 23 | AMBQ | AMERICAN BACKHAULERS CORPORATION | | | SCAC3 |
| 24 | AMBR | AMBROSIA, C D, TRUCKING CO | | | SCAC3 |
| 25 | AMBR | Ambrogio Trasporti S.p.A. | | IT | VKM |
| 26 | AMBRO | AMBRO S.A | | RO | VKM |
| 27 | AMBS | AMBROSE TRUCKING INC | | | SCAC3 |
| 28 | AMBT | AMBER TRUCK LINES | | | SCAC3 |
| 29 | AMBT | AMBERT INTERNATIONAL LOGISTICS | | | SCAC4 |
| 30 | AMBU | AMBER LINE, INC. | | | PWRC |
| 31 | AMBU | Amber Line | | | RSRV |
| 32 | AMBU | AMBER LINE, INC. | | | SCAC3 |
| 33 | AMBU | AMBER LINE, INC. | | | SCAC4 |
| 34 | AMBV | AMI BUS SERVICE | | | SCAC3 |
| 35 | AMBW | AMBASSADOR BROKERAGE LTD | | | SCAC3 |
| 36 | AMBW | AMERICAS BESTWAY | | | SCAC4 |
| 37 | AMBX | American Boiler Works, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 38 | AMBX | Amherst Industries, Inc. | added 1/1961; 4/1961-1/1985; eliminated 10/1990 | | NAKINA |
| 39 | AMBX | Amherst Barge Co. | added 1/1960; eliminated 1/1961 | | NAKINA |
| 40 | AMBX | American Bridge Co. | 8/1920-7/1936; 7/1937 (not listed) | | NAKINA |
| 41 | AMBX | Amherst Barge Co. | added 1/60 | | NRHS |
| 42 | AMBX | Amherst Industries, Inc. | 4/61-1/80; eliminated 10/90 | | NRHS |
| 43 | AMBX | American Boiler Works, Inc. | Jul-00 | | NRHS |
| 44 | AMBX | *AMERICAN BRIDGE CO. | | | PWRC |
| 45 | AMBX | +AMERICAN BOILER WORKS INC. [AMHERST BARGE; AMHERST INDUSTRIES] | | | PWRC |
| 46 | AMBX | Amherst Industries (American Boiler Works) | | | RSRV |
| 47 | AMBY | AMBOY EXPRESS | | | SCAC3 |
| 48 | AMBZ | AMGER MAILING | | | PWRC |
