| 1 | AN | Ansett Australia Holdings Limited | ICAO: AAA, Callsign: Ansett, IATA Prefix: 090, Ceased operations 04 March 2002. | AUS | AVCODES |
| 2 | AN | Australian National Airways PTY Ltd. / Ansett Airways PTY Ltd. | Callsign: Austair, | AUS | AVCODES |
| 3 | AN | Ansett Airlines of Australia | ICAO: AAA, Callsign: Austair, IATA Prefix: 090, Name changed to Ansett Australia Holdings Limited. | AUS | AVCODES |
| 4 | AN | Advanced Air, LLC | ICAO: WSN, Callsign: Wingspan, | USA | AVCODES |
| 5 | AN | AN Ry. LLC | added 1/2003; 7/2005 | | NAKINA |
| 6 | AN | Apalachicola Northern R.R. Co. | 8/1920-7/2000; eliminated 1/2003 | | NAKINA |
| 7 | AN | Apalachicola Northern R.R. Co. | 7/23-7/2000 | | NRHS |
| 8 | AN | AN RAILWAY LLC (APALACHICOLA NORTHERN RAILROAD) | | | PWRC |
| 9 | AN | Apalachicola Northern Railroad (AN Railway) | | | RSRV |
| 10 | AN | Australian National | | AUS | TRAFFIC |
| 11 | AN | Arriva Nederland | | NL | VKM |
| 12 | AN&N | Anthony & Northern Ry. Co. | 8/1920-7/1932 | | NAKINA |
| 13 | AN&N | Anthony & Northern Ry. Co. | 23-Jul | | NRHS |
| 14 | AN&N | ANTHONY & NORTHERN RY. CO. | | | PWRC |
| 15 | ANA | All Nippon Airways Co. Ltd. | IATA: NH, Callsign: All Nippon, IATA Prefix: 205, | J | AVCODES |
| 16 | ANA | All Nippon Airways | IATA: NH | | ICAO1 |
| 17 | ANA | All Nippon Airways Co. Ltd. | | J | TRAFFIC |
| 18 | ANAA | ARGOSY & ATLAS AIR SPACE CARGO | | | SCAC3 |
| 19 | ANAB | AMIINA TRANSPORT | | | SCAC4 |
| 20 | ANAC | ANACHEMIA CHEMICAL INC | | | SCAC4 |
| 21 | ANAD | ANDERSON ARMORED CAR SERVICE INC | | | SCAC3 |
| 22 | ANAE | ANDING TRANSIT INC | | | SCAC3 |
| 23 | ANAG | ANDERSON CARGO SERVICES INC | | | SCAC4 |
| 24 | ANAH | AMERICAN AUTO CARRIERS INC | | | SCAC3 |
| 25 | ANAH | ANNA TRANSPORTATION INC | | | SCAC4 |
| 26 | ANAI | ANAHEIM BUILDERS SUPPLY INC | | | SCAC3 |
| 27 | ANAI | ANTIQUE JUKEBOX RESTORATION | | | SCAC4 |
| 28 | ANAJ | ATLANTIC RELOCATION SYSTEMS | | | SCAC4 |
| 29 | ANAK | ANT EXPRESS INC | | | SCAC4 |
| 30 | ANAL | AMERICAN NATIONAL DIVERSIFIED INC | | | SCAC4 |
| 31 | ANAM | ANANDSIR TRANSPORT LTD | | | SCAC4 |
| 32 | ANAN | ANASTASIO, A & SONS TRUCKING COMPAN | | | SCAC3 |
| 33 | ANAN | ANASTASIO, A & SONS TRUCKING COMPAN | | | SCAC4 |
| 34 | ANAO | ALPERT & ALPERT IRON & METAL INC | | | SCAC3 |
| 35 | ANAP | A & A TRANSPORT INC | | | SCAC3 |
| 36 | ANAQ | ANSAC | | | SCAC4 |
| 37 | ANAR | ANN ARBOR MOVING & STORAGE | | | SCAC3 |
| 38 | ANAR | A & A TRANSPORTATION | | | SCAC4 |
| 39 | ANAS | ANNACIS AUTO TERMINALS LTD | | | SCAC3 |
| 40 | ANAT | A & A TRANSFER & STORAGE INC | | | SCAC3 |
| 41 | ANAT | A & A TRANSFER & STORAGE INC | | | SCAC4 |
| 42 | ANAT | Anatolian | | TR | TRAFFIC |
| 43 | ANATR | Association Neuchâteloise des Amis du Tramway | | CH | TRAFFIC |
| 44 | ANAU | ALLIANCE NAVIGATION LINE, INC. | | | PWRC |
| 45 | ANAU | Alliance Navigation Line | | | RSRV |
| 46 | ANAU | ALLIANCE NAVIGATION LINE | | | SCAC3 |
| 47 | ANAV | A & A TOW SERVICE INC | | | SCAC3 |
| 48 | ANAW | ARTANA | | | SCAC4 |
| 49 | ANAX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 50 | ANAX | General Electric Railcar Services Corp. | added 7/1997; eliminated 1/2000 | | NAKINA |
| 51 | ANAX | EXCEL Railcar Corp. | added 4/1995; eliminated 7/1997 | | NAKINA |
| 52 | ANAX | EXCEL Transnational, Inc. | added 7/1989; 1/1994; eliminated 4/1995 | | NAKINA |
| 53 | ANAX | Excel Railcar Corp. | added 7/1982; 1/1985; eliminated 7/1989 | | NAKINA |
| 54 | ANAX | The Anaconda Co. | added 10/1955; 10/1957; eliminated 10/1960 | | NAKINA |
| 55 | ANAX | Anaconda Copper Mining Co. | 1/1952; 7/1954; eliminated 10/1955 | | NAKINA |
| 56 | ANAX | Anaconda Copper Mining Co. | Jan-52 | | NRHS |
| 57 | ANAX | The Anaconda Co. | 10/57; eliminated 10/60 | | NRHS |
| 58 | ANAX | Excel Railcar Corp. | added 7/82; eliminated 7/89 | | NRHS |
| 59 | ANAX | EXCEL Transnational, Inc. | added 7/89; 1/94; eliminated 4/95 | | NRHS |
| 60 | ANAX | EXCEL Railcar Corp. | added 4/95; eliminated 7/97 | | NRHS |
| 61 | ANAX | General Electric Railcar Services Corp. | added 7/97; eliminated 1/2000 | | NRHS |
| 62 | ANAX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 63 | ANAX | *THE ANACONDA CO. [ANACONDA COPPER MINING CO.] | | | PWRC |
| 64 | ANAX | +GENERAL ELECTRIC RAIL SERVICES CORP. [GENERAL ELECTRIC RAILCAR SERVICES CORP.; EXCEL RAILCAR CORP.; EXCEL TRANSNATIONAL, INC.] | | | PWRC |
| 65 | ANAX | The Anaconda Company (GE Rail Services Corporation) | | | RSRV |
| 66 | ANAX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 67 | ANB | Air Navigation And Trading Co. Ltd. | Callsign: Air Nav, Established in 1947 | GB | AVCODES |
| 68 | ANB | Air New-Bec, Inc | | CDN | AVCODES |
| 69 | ANB | Air Navigation And Trading Co. Ltd. | | | ICAO1 |
| 70 | ANB | Alsternordbahn | | D | TRAFFIC |
| 71 | ANBA | ANDERSON BAKERY CO | | | SCAC3 |
| 72 | ANBD | ANDERSON, BRAD K | | | SCAC4 |
| 73 | ANBF | AMERICAN BACKHAUL | | | SCAC4 |
| 74 | ANBH | A & B HOT SHOT SERVICE | | | SCAC3 |
| 75 | ANBI | A & B CARRIERS INC | | | SCAC3 |
| 76 | ANBJ | ANYWHERE TRANSPORT CORPORATION | | | SCAC4 |
| 77 | ANBK | ANDREWS BUS SERVICE INC | | | SCAC3 |
| 78 | ANBL | A & B LEASING CO | | | SCAC3 |
| 79 | ANBL | A & B LOGISTICS INC | | | SCAC4 |
| 80 | ANBM | AMERICAN BUS LINE INC, THE | | | SCAC4 |
| 81 | ANBN | ANGERER, BENNIE | | | SCAC3 |
| 82 | ANBN | ADRIAN MANUFACTURING INC | | | SCAC4 |
| 83 | ANBO | ANDERSEN BOAT TRANSPORT | | | SCAC4 |
| 84 | ANBP | A & B TRANSPORTATION SERVICES | | | SCAC3 |
| 85 | ANBP | A & B TRANSPORTATION SERVICES | | | SCAC4 |
| 86 | ANBQ | ANDYS BOSTON & QUINCY EXPRESS CO IN | | | SCAC3 |
| 87 | ANBS | ANDERSON BROS STORAGE & MOVING CO | | | SCAC3 |
| 88 | ANBS | ANBROS MARITIME S A | | | SCAC4 |
| 89 | ANBT | AMERICAN BOAT CARRIERS INC | | | SCAC3 |
| 90 | ANBT | AMERICAN BOAT CARRIERS INC | | | SCAC4 |
| 91 | ANBU | ABC CONTAINERLINE N.V. | | | SCAC3 |
| 92 | ANBU | ABC CONTAINERLINE NV | | | SCAC4 |
| 93 | ANBW | A & B WILSON & SONS INC | | | SCAC3 |
| 94 | ANBX | Anbel Corp. (non revenue freight & passenger cars) | 1/1985-1/1994 (not listed) | | NAKINA |
| 95 | ANBX | Anbel Corp. | Jan-94 | | NRHS |
| 96 | ANBX | ANBEL CORPORATION (NON-REV & PSNGR CARS) | | | PWRC |
| 97 | ANBX | Anbel Corporation | | | RSRV |
| 98 | ANBY | A & B CARTAGE INC | | | SCAC3 |
| 99 | ANC | Anglo Airlines Ltd. d/b/a Anglo Cargo Ltd. | IATA: EC, Callsign: Anglo, Ceased operations | GB | AVCODES |
| 100 | ANC | Anglo Airlines Ltd. d/b/a Anglo Cargo Ltd. | IATA: ML, Callsign: Anglo, | GB | AVCODES |
