| 1 | ALT | SBS Aircraft | IATA: XE, Callsign: Green-Craft, | KZ | AVCODES |
| 2 | ALT | Airlake Terminal Railway Co. | eliminated 1/2008 | | NAKINA |
| 3 | ALT | AIRLAKE TERMINAL RAILWAY COMPANY | | | PWRC |
| 4 | ALT | Airlake Terminal Railway | | | RSRV |
| 5 | ALT | AIRLAKE TERMINAL RAILWAY COMPANY | | | SCAC4 |
| 6 | ALTA | Roider GmbH | | DE | VKM |
| 7 | ALTB | ALLIANCE TRANSPORTATION INC | | | SCAC3 |
| 8 | ALTD | ALTURA FARMS LTD | | | SCAC3 |
| 9 | ALTE | ALTIER TRUCKING COMPANY | | | SCAC3 |
| 10 | ALTE | ALL TYPES EXPEDITING & DELIVERY SVS | | | SCAC4 |
| 11 | ALTF | ALLTEX TRANSPORT | | | SCAC4 |
| 12 | ALTH | ATLANTIC COACH & TRANSPORTATION INC | | | SCAC4 |
| 13 | ALTI | ALT SERVICES INC | | | SCAC4 |
| 14 | ALTK | ALLSTATE TRUCKING, INC | | | SCAC3 |
| 15 | ALTK | ALLIANCE TANK LINE INC | | | SCAC4 |
| 16 | ALTL | ALL COAST INTERMODAL SERVICES INC | | | SCAC4 |
| 17 | ALTM | ALTIMAX COURIER LIMITED | | | SCAC4 |
| 18 | ALTM | Autocars Altmann | | L | TRAFFIC |
| 19 | ALTMARK | Altmarktrans Stendal | | D | TRAFFIC |
| 20 | ALTO | ALATORRES TRANSPORTATION SERVICE | | | SCAC3 |
| 21 | ALTO | ALTA TRANSPORTATION INC | | | SCAC4 |
| 22 | ALTON | Chicago and Alton Railroad | | USA | TRAFFIC |
| 23 | ALTP | ALLTOP, RUSSELL E TRANSFER | | | SCAC3 |
| 24 | ALTQ | ALL AREA TRANSIT INC | | | SCAC3 |
| 25 | ALTQ | ALLTECH INC | | | SCAC4 |
| 26 | ALTR | ALTER TRUCKING AND TERMINAL CORPORA | | | SCAC3 |
| 27 | ALTR | ATTS | | | SCAC4 |
| 28 | ALTRA | Altrans Sp. z o.o. | | PL | VKM |
| 29 | ALTS | ALASKA TRANSFER & STORAGE, INC | | | SCAC3 |
| 30 | ALTT | ALTERMAN TRANSPORT LINES, INC | | | SCAC3 |
| 31 | ALTT | ALT TRUCKING INC | | | SCAC4 |
| 32 | ALTU | VTG TANKTAINER ASSETS GMBH | | D | BIC |
| 33 | ALTU | VTG VEREINIGTE TANKLAGER U TRANSPORTMITTEL GMBH | | | PWRC |
| 34 | ALTU | VTG Deutschland | | | RSRV |
| 35 | ALTU | ALGECO | | | SCAC3 |
| 36 | ALTU | VTG AG | | | SCAC4 |
| 37 | ALTV | ALTERNATIVE MOVING SYSTEMS LTD | | | SCAC3 |
| 38 | ALTW | ALLIED TOWING CORP | | | SCAC3 |
| 39 | ALTW | AUTO LINEA SANTA ELENA | | | SCAC4 |
| 40 | ALTX | Alter Trading Corp. | added 10/2006 | | NAKINA |
| 41 | ALTX | Atlas Tank Line Co., Inc. | 7/1930-7/1932 | | NAKINA |
| 42 | ALTX | Southern Illinois Railcar Co. | added 10/1994; 7/2000-7/2005; eliminated 10/2006 | | NAKINA |
| 43 | ALTX | Southern Illinois Railcar Co. | added 10/94; 7/2000 | | NRHS |
| 44 | ALTX | *ATLAS TANK LINE CO. INC. | | | PWRC |
| 45 | ALTX | +ALTER TRADING CO. [SOUTHERN ILLINOIS RAILCAR INC.;(ACL) ARMOUR TANK LINES] | | | PWRC |
| 46 | ALTX | Alter Trading (Southern Illinois Railcar) | | | RSRV |
| 47 | ALTX | ALTER TRADING CORPORATION | | | SCAC4 |
| 48 | ALTY | ALAMO TRANSFORMER SUPPLY COMPANY | | | SCAC4 |
