| 13501 | ASLVG | A.V.G. Ascherleber Verkehrsgesellschaft mbH | | DE | VKM |
| 13502 | ASLW | AMERICAN SHORT LINE RAILROAD ASSOCI | | | SCAC3 |
| 13503 | ASLX | American Surface Lines, LLC | added 1/2007 | | NAKINA |
| 13504 | ASLX | Algoma Steamships, Ltd. | added 1/1979; 1/1980; eliminated 10/1984 | | NAKINA |
| 13505 | ASLX | American Steel Car Lines, Inc. (Inland Car Lines, Inc.) | 7/1935 | | NAKINA |
| 13506 | ASLX | Algoma Steamships, Ltd. | added 1/79; 1/80; eliminated 10/84 | | NRHS |
| 13507 | ASLX | *ALGOMA STEAMSHIPS, LTD. | | | PWRC |
| 13508 | ASLX | +AMERICAN SURFACE LINES, LLC | | | PWRC |
| 13509 | ASLX | Algoma Steamships | | | RSRV |
| 13510 | ASLX | AMERICAN SURFACE LINES LLC | | | SCAC4 |
| 13511 | ASLY | ANT SEACARRIERS LIMITED | | | SCAC3 |
| 13512 | ASLZ | AMERICAN SURFACE LINES LLC | | | SCAC4 |
| 13513 | ASM | Awesome Flight Services (PTY) Ltd. | Callsign: Awesome, | ZA | AVCODES |
| 13514 | ASM | SCTA Air Saint Martin | Callsign: Air Saint Martin, | MAF | AVCODES |
| 13515 | ASM | Airspeed Aviation Inc. | Callsign: Speedline, | CDN | AVCODES |
| 13516 | ASM | Awesome Flight Services (PTY) Ltd. | | | ICAO1 |
| 13517 | ASM | Azienda Servizi Mobilita S.p.A. | City: Venice | I | TRAFFIC |
| 13518 | ASM | Aare Seeland Mobil AG | | CH | VKM |
| 13519 | ASMA | ATLANT SHIP MANAGEMENT 9EUROPE) NV | | | SCAC3 |
| 13520 | ASMB | ASMUSSEN TRUCKING | | | SCAC3 |
| 13521 | ASMC | ALL STAR MOVING SYSTEMS INC | | | SCAC4 |
| 13522 | ASMD | ATLANTIC STANDARD MOLDING | | | SCAC4 |
| 13523 | ASME | ALL STATES MOVING & STORAGE INC | | | SCAC3 |
| 13524 | ASME | ALL STATES MOVING & STORAGE INC | | | SCAC4 |
| 13525 | ASMF | AIR-SEA/M F INC. | | | SCAC3 |
| 13526 | ASMG | ASP SHIP MANAGEMENT PTY LTD | | | SCAC4 |
| 13527 | ASMH | ASHTON MOVING & TRUCKING | | | SCAC3 |
| 13528 | ASMH | A SUPERIOR MOVING AND STORAGE INC | | | SCAC4 |
| 13529 | ASMI | ALL SEASON MOVERS INC | | | SCAC3 |
| 13530 | ASMJ | A-SEAMANS MOVING CO | | | SCAC3 |
| 13531 | ASMK | ASSORTATO, MIKE INC | | | SCAC3 |
| 13532 | ASMK | AMERICAN FREIGHT SOLUTIONS INC | | | SCAC4 |
| 13533 | ASML | The Atlanta, Stone Mountain & Lithonia Ry. Co. | 1/1975-1/1980 | | NAKINA |
| 13534 | ASML | The Atlanta, Stone Mountain & Lithonia Ry. Co. | 1/75-1/80 | | NRHS |
| 13535 | ASML | ATLANTA, STONE MOUNTAIN & LITHONIA RY. CO. | | | PWRC |
| 13536 | ASML | Atlanta, Stone Mountain and Lithonia Railway | | | RSRV |
| 13537 | ASML | ATLANTA STONE MOUNTAIN & LITHONIA R | | | SCAC3 |
| 13538 | ASMM | AMERICAN SHAMROCK MOVING COMPANY | | | SCAC3 |
| 13539 | ASMM | ARMONIA SHIPMANAGEMENT S A | | | SCAC4 |
| 13540 | ASMN | ALLSTATES MOVING & STORAGE | | | SCAC3 |
| 13541 | ASMN | ARMSTRONG MARINE | | | SCAC4 |
| 13542 | ASMO | ASTRO MOVING STORAGE CO | | | SCAC3 |
| 13543 | ASMP | ASM GROUP INC | | | SCAC4 |
| 13544 | ASMQ | ASSOCIATED MOVERS | | | SCAC3 |
| 13545 | ASMQ | ALL SEASONS MOVING & STORAGE INC | | | SCAC4 |
| 13546 | ASMR | A S M R DELIVERY SERVICE | | | SCAC3 |
| 13547 | ASMS | ALTIUS MARINE S A | | | SCAC4 |
| 13548 | ASMU | ALPAS SERVIS LTD | | RUS | BIC |
| 13549 | ASMV | A SUPREME MOVING & STORAGE | | | SCAC3 |
| 13550 | ASMW | ALL STATES MOTOR FREIGHT INC | | | SCAC3 |
| 13551 | ASMX | Industria Minera Mexico, S.A. (reporting marks being changed to IMMX) | added 7/1975; eliminated 10/1979 | | NAKINA |
| 13552 | ASMX | Asarco Mexicana, S.A. | added 10/1965; 10/1966-1/1975; eliminated 7/1975 | | NAKINA |
| 13553 | ASMX | Asarco Mexicana, S.A. | added 10/65; 10/66-1/75; eliminated 7/75 | | NRHS |
| 13554 | ASMX | Industria Minera Mexico, S.A. (reporting marks being changed to IMMX) | added 7/75 | | NRHS |
| 13555 | ASMX | INDUSTRIA MINERA MEXICO, SA (IMMX) [ASARCO MEXICANA, SA] | | | PWRC |
| 13556 | ASMX | Ames And Sons Machine Works | | | RSRV |
| 13557 | ASMX | ASARCO MEXICANA S A | | | SCAC3 |
| 13558 | ASMY | ASCA MARINE INC | | | SCAC3 |
| 13559 | ASN | Air and Sea Transport | | RUS | AVCODES |
| 13560 | ASN | Air Straubing Luftfahrtgesellschaft mbH | | D | AVCODES |
| 13561 | ASN | Air Service Nantes | Callsign: Air Nantes, | F | AVCODES |
| 13562 | ASN | Spectrem Air Ltd. | Callsign: Prospector, | ZA | AVCODES |
| 13563 | ASN | Air Service Nantes | | F | AVCODES |
| 13564 | ASN | Air and Sea Transport | | | ICAO1 |
| 13565 | ASN | Allentown Scranton and Northern | | USA | TRAFFIC |
| 13566 | ASNB | AMERICAN SHIPPING LINE LIMITED LIAB | | | SCAC4 |
| 13567 | ASNC | A N C ASSOCIATED NATIONAL COURIERS | | | SCAC3 |
| 13568 | ASND | ATKINSON DISTRIBUTING INC | | | SCAC3 |
| 13569 | ASNF | ASTIN FARMS | | | SCAC3 |
| 13570 | ASNF | AGUIRRE SANCHEZ, FERNANDO | | | SCAC4 |
| 13571 | ASNG | AMES SAND & GRAVEL INC | | | SCAC3 |
| 13572 | ASNG | ARTESANIAS EN GENERAL | | | SCAC4 |
| 13573 | ASNH | ATLAS SN INC | | | SCAC4 |
| 13574 | ASNI | ALL STATES TRANSPORTATION INC | | | SCAC3 |
| 13575 | ASNI | ASK TRANSPORTATION INC | | | SCAC4 |
| 13576 | ASNJ | A & S TRUCKING INC | | | SCAC3 |
| 13577 | ASNJ | ASA TRUCKING LLC | | | SCAC4 |
| 13578 | ASNK | AUSTIN TRUCKING INC | | | SCAC3 |
| 13579 | ASNK | AUSTIN TRUCKING INC | | | SCAC4 |
| 13580 | ASNL | ALBETH SALES & LEASING INC | | | SCAC3 |
| 13581 | ASNL | ATLANTIC STAINLESS FABRICATORS LTD | | | SCAC4 |
| 13582 | ASNM | A STARI NITE LIMOUSINE SERVICE | | | SCAC3 |
| 13583 | ASNN | ALL SEASONS ENTERPRISES | | | SCAC3 |
| 13584 | ASNN | ALPHA SUN INTERNATIONAL INC | | | SCAC4 |
| 13585 | ASNO | ATLANTIC SALMON FEDERATION | | | SCAC4 |
| 13586 | ASNP | ATLAS MANAGEMENT CORPORATION | | | SCAC3 |
| 13587 | ASNQ | ASSOCIATED NORTH AMERICAN INC | | | SCAC3 |
| 13588 | ASNR | ASSOCIATED NATIONAL COURIERS | | | SCAC3 |
| 13589 | ASNS | ASBRIDGE & SON | | | SCAC3 |
| 13590 | ASNS | A STONE TRANSPORTATION | | | SCAC4 |
| 13591 | ASNT | ATLANTIC STORAGE & TRANSFER INC | | | SCAC3 |
| 13592 | ASNU | ALISAN ULUSLARARASI TASIMACILIK VE TICARET AS | | TR | BIC |
| 13593 | ASNU | AMERICAN ATLANTIC LINES | | | SCAC3 |
| 13594 | ASNU | AMERICAN ATLANTIC LINES | | | SCAC4 |
| 13595 | ASNW | AERO SNOW REMOVAL CORP | | | SCAC4 |
| 13596 | ASNY | A & L TRANSPORTATION | | | SCAC4 |
| 13597 | ASO | Aero Slovakia a.s. | Callsign: Aero Nitra, | SK | AVCODES |
| 13598 | ASO | Air Sarthe Organisation SA | Callsign: Azaud, | F | AVCODES |
| 13599 | ASO | Aerosul Taxi Aéreo Ltda | Callsign: Aerosul, | BR | AVCODES |
| 13600 | ASO | Aero Slovakia | | | ICAO1 |
