| 1 | AC | Air Canada | ICAO: ACA, Callsign: Air Canada, IATA Prefix: 014, | CDN | AVCODES |
| 2 | AC | Algoma Central Ry., Inc. | added 10/1995; 7/2000-7/2005 | | NAKINA |
| 3 | AC | Algoma Central R.R., Inc. | added 4/1995 | | NAKINA |
| 4 | AC | Algoma Central Ry. | 10/1966-1/1994; eliminated 4/1995 | | NAKINA |
| 5 | AC | Algoma Central & Hudson Bay Ry. Co. | 7/1923-7/1965 | | NAKINA |
| 6 | AC | Algoma Central & Hudson Bay Ry. Co. | 7/23-7/65 | | NRHS |
| 7 | AC | Algoma Central Ry. | 10/66-1/94; eliminated 4/95 | | NRHS |
| 8 | AC | Algoma Central R.R., Inc. | added 4/95 | | NRHS |
| 9 | AC | Algoma Central Ry., Inc. | added 10/95; 7/2000 | | NRHS |
| 10 | AC | *ATLANTIC CITY RAILROAD | | | PWRC |
| 11 | AC | +ALGOMA CENTRAL RAILWAY (CANADIAN NATIONAL RWY.) [ALGOMA CENTRAL & HUDSON BAY RY. CO.] | | | PWRC |
| 12 | AC | Algoma Central and Hudson Bay Railway (Algoma Central Railway) | | | RSRV |
| 13 | AC | ALGOMA CENTRAL RAILROAD INC | | | SCAC4 |
| 14 | AC | Algoma Central | | USA | TRAFFIC |
| 15 | AC&Y | NORFOLK SOUTHERN [AKRON, CANTON & YOUNGSTON RAILROAD] | | | PWRC |
| 16 | ACA | Air Canada | IATA: AC, Callsign: Air Canada, IATA Prefix: 014, | CDN | AVCODES |
| 17 | ACA | Air Canada | IATA: AC | | ICAO1 |
| 18 | ACA | ALUMINUM COMPANY OF AMERICA (ALCOA) | | | PWRC |
| 19 | ACA | Air Canada | | CDN | TRAFFIC |
| 20 | ACAA | AMER-CANA GALLERIES | | | SCAC4 |
| 21 | ACAB | AMERICAN CAB CO | | | SCAC3 |
| 22 | ACAB | ACROLAB LTD | | | SCAC4 |
| 23 | ACAC | ACACIA VAN & STORAGE CO | | | SCAC3 |
| 24 | ACAC | Air Canada Cargo | Real: ACA / AC, Air Canada Cargo is the cargo service subsidiary of Air Canada. | CDN | TRAFFIC |
| 25 | ACAD | ACADEMY VAN & STORAGE COMPANY, INC | | | SCAC3 |
| 26 | ACAD | ACADEMY VAN & STORAGE COMPANY, INC | | | SCAC4 |
| 27 | ACAD | Academy Bus Lines | Real: ACADEMY | USA | TRAFFIC |
| 28 | ACAE | AMERICAN CARTAGE AGENCY LTD | | | SCAC4 |
| 29 | ACAF | A A CARRIERS INC | | | SCAC3 |
| 30 | ACAG | ACTION AIR SERVICES INC | | | SCAC3 |
| 31 | ACAG | AUTOTRANSPORTES DE CARGA AGUILAS DE | | | SCAC4 |
| 32 | ACAH | ACCA TRUCKING INC | | | SCAC3 |
| 33 | ACAI | ALL-CAL TOURS INC | | | SCAC3 |
| 34 | ACAI | ALTAMIRANO CAMPOS, ISRAEL | | | SCAC4 |
| 35 | ACAJ | A C T INC | | | SCAC3 |
| 36 | ACAK | A C A TRUCKING CO INC | | | SCAC3 |
| 37 | ACAL | ACTION CARTAGE INC | | | SCAC3 |
| 38 | ACAM | AMERICAN RAMP TRANSIT INC | | | SCAC4 |
| 39 | ACAN | ACTION AMERICAN CHARTER COACHES | | | SCAC3 |
| 40 | ACAN | ACAN WINDOW SYSTEMS INC | | | SCAC4 |
| 41 | ACAO | ACTIVE MOVING AND STORAGE | | | SCAC3 |
| 42 | ACAO | AHTICAL TRANSPORT INC | | | SCAC4 |
| 43 | ACAP | ACE & ACME INC | | | SCAC3 |
| 44 | ACAP | ACAM TRANSPORT INC | | | SCAC4 |
| 45 | ACAQ | ACE CARTAGE CO | | | SCAC3 |
| 46 | ACAQ | ARMOIRES CUISINES ACTION | | | SCAC4 |
| 47 | ACAR | AIR CARGO AMERICA MOTOR | | | SCAC3 |
| 48 | ACAR | AMERICAN CARGOES INC | | | SCAC4 |
| 49 | ACAS | ACE MOVING & STORAGE INC | | | SCAC3 |
| 50 | ACAS | AIR CARGO EXPRESS | | | SCAC4 |
| 51 | ACAT | ARMENTROUT TRUCK LINE | | | SCAC3 |
| 52 | ACAT | ABSOLUTE COURIER & TRANSPORT INC | | | SCAC4 |
| 53 | ACAU | ARCTIC CONTAINER OY | | FIN | BIC |
| 54 | ACAU | ARAWAK CARIBBEAN LINE LTD. | | | SCAC3 |
| 55 | ACAU | ARCTIC CONTAINER OY | | | SCAC4 |
| 56 | ACAW | AMERICAL TRANSPORT INC | | | SCAC3 |
| 57 | ACAX | Honeywell International, Inc. | added 7/2000; 7/2000-7/2005 | | NAKINA |
| 58 | ACAX | AlliedSignal Inc. | added 1/1999; eliminated 7/2000 | | NAKINA |
| 59 | ACAX | Allied Chemical Co. (Allied Corp.) | added 7/1993; eliminated 1/1999 | | NAKINA |
| 60 | ACAX | Allied Chemicals Canada, Inc. | added 10/1988; eliminated 7/1993 | | NAKINA |
| 61 | ACAX | Allied Canada, Ltd. | added 7/1987; eliminated 10/1988 | | NAKINA |
| 62 | ACAX | Allied Chemical, a Division of Allied Canada, Inc. | added 5/1983; 1/1985; eliminated 7/1987 | | NAKINA |
| 63 | ACAX | Allied Chemical Canada, Ltd. | eliminated 5/1983 | | NAKINA |
| 64 | ACAX | Aluminum Co. of America | 7/1923 | | NAKINA |
| 65 | ACAX | Allied Chemical Canada, Ltd. | eliminated 5/83 | | NRHS |
| 66 | ACAX | Allied Chemical, a Division of Allied Canada, Inc. | added 5/83; eliminated 7/87 | | NRHS |
| 67 | ACAX | Allied Canada, Ltd. | added 7/87; eliminated 10/88 | | NRHS |
| 68 | ACAX | Allied Chemicals Canada, Inc. | added 10/88; eliminated 7/93 | | NRHS |
| 69 | ACAX | Allied Chemical Co. (Allied Corp.) | added 7/93; eliminated 1/99 | | NRHS |
| 70 | ACAX | AlliedSignal Inc. | added 1/99; eliminated 7/2000 | | NRHS |
| 71 | ACAX | Honeywell International, Inc. | added 7/2000; 7/2000 | | NRHS |
| 72 | ACAX | *ALUMINUM COMPANY OF AMERICA | | | PWRC |
| 73 | ACAX | *ALLIED SIGNAL [ALLIED CHEMICAL DIV OF CANADA] (ALLIED CORPORATION) | | | PWRC |
| 74 | ACAX | +HONEYWELL INTERNATIONAL, INC. | | | PWRC |
| 75 | ACAX | Aluminum of America (Alcoa) | | | RSRV |
| 76 | ACAX | HONEYWELL INTERNATIONAL INC | | | SCAC4 |
| 77 | ACAY | ACADEMY AIR CARGO INC | | | SCAC3 |
| 78 | ACB | African Cargo Services Limited | Callsign: Africargo, | EAK | AVCODES |
| 79 | ACB | Air Business Contact A.B.C. | Callsign: Air Contact, | F | AVCODES |
| 80 | ACB | Air Continental Africa | Callsign: Airconti, | G | AVCODES |
| 81 | ACB | Achenseebahn | | A | TRAFFIC |
| 82 | ACBA | ARABI CAB CO INC | | | SCAC3 |
| 83 | ACBB | ADAM CAB INC | | | SCAC3 |
| 84 | ACBB | A & C TRANSPORT | | | SCAC4 |
| 85 | ACBC | ABLE CHARTER BUS COMPANY | | | SCAC3 |
| 86 | ACBC | A&C Bus Corp | | USA | TRAFFIC |
| 87 | ACBF | AR TRANSPORT | | | SCAC3 |
| 88 | ACBJ | AIM CARIBBEAN EXPRESS | | | SCAC3 |
| 89 | ACBK | ACADIA TRUCKING & BROKERAGE LTD | | | SCAC3 |
| 90 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | 1/1975-7/2005 | | NAKINA |
| 91 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | 1/75-1/80 | | NRHS |
| 92 | ACBL | American Commercial Barge Lines, Inc. | Jan-94 | | NRHS |
| 93 | ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | Jul-00 | | NRHS |
| 94 | ACBL | AMERICAN COMMERCIAL BARGE LINES, INC. | | | PWRC |
| 95 | ACBL | American Commercial Barge Lines | | | RSRV |
| 96 | ACBL | AMERICAN COMMERICAL BARGE LINE COMP | | | SCAC3 |
| 97 | ACBL | ATLANTIC CARIBBEAN LINE INC | | | SCAC4 |
| 98 | ACBM | ATLANTIC COAST TRANSPORTATION INC | | | SCAC3 |
| 99 | ACBM | AUTOTRANSPORTES DE CARGA BALSA S A | | | SCAC4 |
| 100 | ACBN | ACTION BONDED MESSENGER & DELIVERY | | | SCAC3 |
