| 1 | ATL | Aerocentral, S.A. de C.V. | Callsign: Centralmex, | MEX | AVCODES |
| 2 | ATL | Air Atlantic | Callsign: Dash, | CDN | AVCODES |
| 3 | ATL | Atlas Air Service AG | Callsign: Air Bremen, | D | AVCODES |
| 4 | ATL | Aerocentral | | | ICAO1 |
| 5 | ATL | Armour Tank Line (Armour Car Lines) | 7/1935 | | NAKINA |
| 6 | ATL | Ammendorfer Transport und Logistik GmbH | Halle | D | privat-bahn.de |
| 7 | ATL | AT&L RAILROAD CO., INC. [AUSTIN, TODD & LADD RAILROAD CO.] | | | PWRC |
| 8 | ATL | Atlas Maschinen GmbH | | DE | VKM |
| 9 | ATLA | ATLANTIC MOVERS INC | | | SCAC3 |
| 10 | ATLA | ARROW TRANSPORTATION LOGISTICS INC | | | SCAC4 |
| 11 | ATLAS | Atlas | | USA | TRAFFIC |
| 12 | ATLAS | ATLAS Leipzig Baupartner GmbH | | DE | VKM |
| 13 | ATLB | A T L INC | | | SCAC3 |
| 14 | ATLB | A T L INC | | | SCAC4 |
| 15 | ATLC | ATLANTIC TUBE & STEEL INC | | | SCAC3 |
| 16 | ATLC | ATLANTIC TUBE & STEEL INC | | | SCAC4 |
| 17 | ATLD | Alpha Trains Locomotives GmbH | | DE | VKM |
| 18 | ATLF | ATLAS FREIGHT LINES, INC | | | SCAC3 |
| 19 | ATLF | ACCESS TRANSPORT & LOGISTICS INC | | | SCAC4 |
| 20 | ATLG | ATLANTIC DISTRIBUTION SYSTEMS INC | | | SCAC3 |
| 21 | ATLG | AMERICAN TRANSPORTATION & LOGISTICS | | | SCAC4 |
| 22 | ATLH | ATLANTIC HAULAGE CORP | | | SCAC3 |
| 23 | ATLH | ATLANTIC HAULAGE CORP | | | SCAC4 |
| 24 | ATLI | A T L INC | | | SCAC4 |
| 25 | ATLI | Alpha Trains Luxembourg No. 2 S.à.r.l. | | LU | VKM |
| 26 | ATLJ | ATLAS MANUFACTURING LIMITED | | | SCAC4 |
| 27 | ATLK | ATLANTIK DENIZCILIK TICADET VE SANA | | | SCAC4 |
| 28 | ATLL | ATLANTA LIMOUSINE SERVICE | | | SCAC3 |
| 29 | ATLL | ATLAS LINE | | | SCAC4 |
| 30 | ATLN | ATWOOD TRUCK LINE, INC | | | SCAC3 |
| 31 | ATLN | ADDTRAN LOGISTICS INC | | | SCAC4 |
| 32 | ATLO | ATLANTIC TANK LINES | | | SCAC3 |
| 33 | ATLP | ATL AUTOTRANSPORTES | | | SCAC4 |
| 34 | ATLQ | ATLAS WAREHOUSING COMPANY | | | SCAC3 |
| 35 | ATLQ | ALL TRANS LOGISTICS INC | | | SCAC4 |
| 36 | ATLR | ATLANTIC TRANSPORT CO | | | SCAC3 |
| 37 | ATLS | ATLANTIC COAST MOVING & STORAGE CO | | | SCAC3 |
| 38 | ATLS | ATLANTIC COAST MOVING & STORAGE INC | | | SCAC4 |
| 39 | ATLT | AT&L R.R. Co. | added 10/1985; 1/1994-7/2000; eliminated 4/2001; 7/2005 | | NAKINA |
| 40 | ATLT | AT&L R.R. Co. | 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 41 | ATLT | AT&L RAILROAD CO., INC. [AUSTIN, TODD & LADD RAILROAD CO.] | | | PWRC |
| 42 | ATLT | AT&L Railroad | | | RSRV |
| 43 | ATLT | AT & L RAILROAD CO INC | | | SCAC3 |
| 44 | ATLT | AT & L RAILROAD CO INC | | | SCAC4 |
| 45 | ATLU | ALBATROSS TANK LEASING B.V. | | NL | BIC |
| 46 | ATLU | AMERICAN MARINE INDUSTRIES | | | PWRC |
| 47 | ATLU | American Marine Industries | | | RSRV |
| 48 | ATLU | ATLANTIC LINES LTD | | | SCAC3 |
| 49 | ATLU | ATLAS CONTAINER & TRADING GMBH | | | SCAC4 |
| 50 | ATLU | Alpha Trains Luxembourg s.à.r.l. | | LU | VKM |
| 51 | ATLV | ATL INDUSTRIES | | | SCAC4 |
| 52 | ATLW | ATLAS CARRIERS INC | | | SCAC3 |
| 53 | ATLX | Atlas Machine & Iron Works, Inc. | added 7/1980; eliminated 1/1986; 1/1994-7/2005 (not listed) | | NAKINA |
| 54 | ATLX | General American Transportation Corp. | 4/1970; eliminated 7/1973 | | NAKINA |
| 55 | ATLX | Armour Tank Line (General American Transportation Corp.) | 10/1966 | | NAKINA |
| 56 | ATLX | General American Transportation Corp. | added 10/1958; 7/1965 | | NAKINA |
| 57 | ATLX | Armour Car Lines | eliminated 10/1958 | | NAKINA |
| 58 | ATLX | General American Transportation Corp. | 7/1937-10/1957; 4/1961 | | NAKINA |
| 59 | ATLX | Armour Tank Line (Armour Car Lines) | 7/1935 | | NAKINA |
| 60 | ATLX | Armour Tank Line (Armour Car Lines) | Apr-38 | | NRHS |
| 61 | ATLX | General American Transportation Corp. | 1/52-4/61 | | NRHS |
| 62 | ATLX | Armour Car Lines | eliminated 10/58 | | NRHS |
| 63 | ATLX | General American Transportation Corp. | added 10/58; 7/65 | | NRHS |
| 64 | ATLX | Armour Tank Line (General American Transportation Corp.) | Oct-66 | | NRHS |
| 65 | ATLX | General American Transportation Corp. | 4/70; eliminated 7/73 | | NRHS |
| 66 | ATLX | Atlas Machine & Iron Works, Inc. | added 7/80; eliminated 1/86; 1/94-7/2000 | | NRHS |
| 67 | ATLX | *ARMOUR TANK LINE (ACL) (GENERAL AMERICAN TRANSPORTATION CORP.) (ELIMINATED 7/1973) | | | PWRC |
| 68 | ATLX | +ATLAS MACHINE & IRON WORKS, INC. | | | PWRC |
| 69 | ATLX | Atlas Machine and Iron Works | | | RSRV |
| 70 | ATLX | ATLAS MACHINE & IRON WORKS, INC. | | | SCAC4 |
| 71 | ATLX | Atlantic Express | | US-NY | TRAFFIC |
| 72 | ATLY | A T L INC | | | SCAC3 |
| 73 | ATLY | ATL | | | SCAC4 |
| 74 | ATLZ | AMERICAN MARINE INDUSTRIES | | | PWRC |
| 75 | ATLZ | American Marine Industries | | | RSRV |
| 76 | ATLZ | ATLANTIC LINES LTD | | | SCAC3 |
| 77 | ATLZ | AMERICAN MARINE INDUSTRIES | | | SCAC4 |
