| 1 | ACL | Air Cavrel | Callsign: Cavrel, | GB | AVCODES |
| 2 | ACL | Transporti Aerei Italiani S.r.l. | IATA: 9X, Callsign: Spada, Name changed to Itali Airlines s.r.l. ICAO designator changed from ACO | I | AVCODES |
| 3 | ACL | Itali Airlines s.r.l. | IATA: 9X, Callsign: Itali, Name changed from Transporti Aerei Italiani S.r.l. ICAO designator changed from ACO | I | AVCODES |
| 4 | ACL | Air California | IATA: OC, Callsign: Aircal, Founded in 1967. Merged into American Airlines during 1987. | USA | AVCODES |
| 5 | ACL | Itali Airlines s.r.l. | IATA: FS, Callsign: Itali, Name changed from Transporti Aerei Italiani S.r.l. ICAO designator changed from ACO | I | AVCODES |
| 6 | ACL | Aercaribe Aerolina del Caribe, S.A. | IATA: JK, Callsign: Admire, IATA Prefix: 543, Founded in 1997 | CO | AVCODES |
| 7 | ACL | Itali Airlines | IATA: 9X | | ICAO1 |
| 8 | ACL | CSX Transportation, Inc. | added 7/1987; 1/1994-7/2005 | | NAKINA |
| 9 | ACL | Seaboard System R.R., Inc. | added 1/1983; 1/1985; eliminated 7/1987 | | NAKINA |
| 10 | ACL | Seaboard Coast Line R.R. Co. | 1/1975-1/1980; eliminated 1/1983 | | NAKINA |
| 11 | ACL | Atlantic Coast Line R.R. Co. | 7/1923-4/1970 | | NAKINA |
| 12 | ACL | Atlantic Coast Line R.R. Co. | 7/23-4/70 | | NRHS |
| 13 | ACL | Seaboard Coast Line R.R. Co. | 1/75-1/80; eliminated 1/83 | | NRHS |
| 14 | ACL | Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | | NRHS |
| 15 | ACL | CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | | NRHS |
| 16 | ACL | CSX TRANSPORTATION, INC. [ATLANTIC COAST LINE; SEABOARD COAST LINE] | | | PWRC |
| 17 | ACL | Atlantic Coast Line Railroad (CSX Transportation) | | | RSRV |
| 18 | ACL | Atlantic Coast Line | | USA | TRAFFIC |
| 19 | ACLB | ASSOCIATED TRANSPORT LINE (BERMUDA) | | | SCAC4 |
| 20 | ACLC | A C LEASING COMPANY | | | SCAC3 |
| 21 | ACLD | ACTION LUMBER INC | | | SCAC3 |
| 22 | ACLE | AMERICAN COACH LINES INC (DC CORP) | | | SCAC3 |
| 23 | ACLF | AMERICAN COACH LINES INC | | | SCAC3 |
| 24 | ACLF | AMERI-CAN LOGISTICS LTD | | | SCAC4 |
| 25 | ACLG | ALL CHICAGO LAND MOVING & STORAGE | | | SCAC3 |
| 26 | ACLG | AC LOGISTICS LLC | | | SCAC4 |
| 27 | ACLI | ALLEN, CHARLES L | | | SCAC3 |
| 28 | ACLI | ASTRO-CHEM LAB INC | | | SCAC4 |
| 29 | ACLJ | AC STORES AND OIL COMPANY | | | SCAC4 |
| 30 | ACLK | ACCELL AIR TRANSPORT | | | SCAC3 |
| 31 | ACLK | AMERICAN COACH LINES OF JACKSONVILL | | | SCAC4 |
| 32 | ACLL | ALL CAL MOBILE HOME TRANSPORT | | | SCAC3 |
| 33 | ACLM | ARISTOCRAT LIMOUSINE SERVICE | | | SCAC3 |
| 34 | ACLN | A-C LOGISTICS (N/K/A GREATWIDE TRAN | | | SCAC4 |
| 35 | ACLO | AMERICAN COLORS INC | | | SCAC3 |
| 36 | ACLO | ADVANCE LOGISTICS LLC | | | SCAC4 |
| 37 | ACLP | AMERICAN CLIPPER TRANSFER & STORAGE | | | SCAC3 |
| 38 | ACLP | AMERICAN CLIPPER TRANSFER & STORAGE | | | SCAC4 |
| 39 | ACLQ | ACTION CARTAGE & LEASING CO | | | SCAC3 |
| 40 | ACLR | ATKKO CARRIERS LLC | | | SCAC4 |
| 41 | ACLS | AMERICAN COACH LINES OF ORLANDO INC | | | SCAC4 |
| 42 | ACLS | Atlantic Container Line | Real: ACL | GB | TRAFFIC |
| 43 | ACLU | ATLANTIC CONTAINER LINE | | USA | BIC |
| 44 | ACLU | ATLANTIC CONTAINER LINE LTD | | | PWRC |
| 45 | ACLU | Atlantic Container Line | | | RSRV |
| 46 | ACLU | ATLANTIC CONTAINER LINES LTD | | | SCAC3 |
| 47 | ACLU | ATLANTIC CONTAINER LINE AB | | | SCAC4 |
| 48 | ACLV | AMERICAN CONTINENTAL VAN LINES INC | | | SCAC3 |
| 49 | ACLX | American Car Line Co. | 1/1994-7/2005 (not listed) | | NAKINA |
| 50 | ACLX | Allied Chemical Corp. | added 10/1962; eliminated 10/1963 | | NAKINA |
| 51 | ACLX | A.C. Lawrence Leather Co. | 7/1937-4/1938 (not listed) | | NAKINA |
| 52 | ACLX | American Car Line Co. | 1/94-7/2000 | | NRHS |
| 53 | ACLX | *A. C. LAWRENCE LEATHER CO. | | | PWRC |
| 54 | ACLX | *ALLIED CHEMICAL CORP. | | | PWRC |
| 55 | ACLX | *AMERICAN CAR LINE COMPANY | | | PWRC |
| 56 | ACLX | American Car Line | | | RSRV |
| 57 | ACLY | AUTOMOBILE CARRIERS LIMITED | | | SCAC3 |
| 58 | ACLZ | ATLANTIC CONTAINER LINE AB | | | SCAC4 |
