| 2501 | ACO | Aero Comondu | | | ICAO1 |
| 2502 | ACOA | AMERICA CARGO TRANSPORT CORP | | | SCAC4 |
| 2503 | ACOB | ACORN BUILDING COMPONENTS INC | | | SCAC3 |
| 2504 | ACOC | ANDERSON, A COURIER & TRANSPORTATIO | | | SCAC3 |
| 2505 | ACOD | ANCOR TRANSPORT LTD | | | SCAC4 |
| 2506 | ACOE | A C OERSSLEFFS EFTF A/S | | | SCAC4 |
| 2507 | ACOE | American Coal Enterprises | | USA | TRAFFIC |
| 2508 | ACOF | ACORN FORWARDING INC | | | SCAC3 |
| 2509 | ACOH | AEROPRES CORPORATION | | | SCAC4 |
| 2510 | ACOI | ALL COAST TRANSPORT CORP | | | SCAC3 |
| 2511 | ACOJ | ACORN TRANSPORT CO | | | SCAC3 |
| 2512 | ACOK | ACE TRANSFER & STORAGE | | | SCAC3 |
| 2513 | ACOL | ALERT COACH LINES INC | | | SCAC3 |
| 2514 | ACOL | ACT CARRIERS LLC | | | SCAC4 |
| 2515 | ACOM | ACTION MOVING & STORAGE INC | | | SCAC3 |
| 2516 | ACOM | AUTO TRANSPORTES COMANCHE S A DE C | | | SCAC4 |
| 2517 | ACOO | ALLAN COMPANY | | | SCAC3 |
| 2518 | ACOO | ALLAN COMPANY | | | SCAC4 |
| 2519 | ACOP | ACTION TRANSIT COMPANY | | | SCAC3 |
| 2520 | ACOQ | AIRCO TRUCKING (A DIV OF THE BOC GR | | | SCAC3 |
| 2521 | ACOQ | AASP INC OF COLORADO | | | SCAC4 |
| 2522 | ACOR | ATL CORPORATION | | | SCAC3 |
| 2523 | ACOR | ACRO INC | | | SCAC4 |
| 2524 | ACOS | ACCORD SERVICES, INC. | | | SCAC3 |
| 2525 | ACOT | ACOTRAL | Roma - Ostia Lido | I | TRAFFIC |
| 2526 | ACOU | COMPAÑIA LOGISTICA ACOTRAL, S.A.U. | | E | BIC |
| 2527 | ACOU | ASSOCIATED OCTEL CO., LTD. | | | PWRC |
| 2528 | ACOU | Associated Octel | | | RSRV |
| 2529 | ACOU | ACO BV | | | SCAC4 |
| 2530 | ACOV | ACOMA VAN & STORAGE | | | SCAC3 |
| 2531 | ACOV | ACOMA VAN & STORAGE | | | SCAC4 |
| 2532 | ACOW | AUTO CONNECTIONS INC | | | SCAC3 |
| 2533 | ACOW | ARCADIA COOPERATIVE ASSOCIATION | | | SCAC4 |
| 2534 | ACOX | Chrysler Rail Transportation Corp. | added 1/1990; 1/1994 (not listed); eliminated 1/1997 | | NAKINA |
| 2535 | ACOX | Aurora Cooperative Elevator Co. | added 10/1970; 1/1975-1/1985; eliminated 1/1990 | | NAKINA |
| 2536 | ACOX | Wright Chemical Corp. | added 1/1965; 7/1965-10/1966; eliminated 1/1967 | | NAKINA |
| 2537 | ACOX | American Cotton Oil Co. | 8/1920-7/1923 | | NAKINA |
| 2538 | ACOX | Wright Chemical Corp. | added 1/65; 7/65-10/66; eliminated 1/67 | | NRHS |
| 2539 | ACOX | Aurora Cooperative Elevator Co. | added 10/70; 1/75-1/80; eliminated 1/90 | | NRHS |
| 2540 | ACOX | Chrysler Rail Transportation Corp. | added 1/90; 1/94; eliminated 1/97 | | NRHS |
| 2541 | ACOX | *AMERICAN COTTON OIL CO. | | | PWRC |
| 2542 | ACOX | *WRIGHT CHEMICAL CORP. | | | PWRC |
| 2543 | ACOX | *AURORA COOPERATIVE ELEVATOR CO | | | PWRC |
| 2544 | ACOX | *CHRYSLER RAIL TRANSPORTATION CORPORATION | | | PWRC |
| 2545 | ACOX | Aurora Cooperative Elevator | | | RSRV |
| 2546 | ACOX | WRIGHT CHEMICAL CORP | | | SCAC3 |
| 2547 | ACOZ | AMERICAN COLLOID CO. | | | PWRC |
| 2548 | ACP | Air Cape | Callsign: Cape, Designator KP recalled by IATA | ZA | AVCODES |
| 2549 | ACP | Air Cape | IATA: KP, Callsign: Cape, Designator KP recalled by IATA | ZA | AVCODES |
| 2550 | ACP | Astral Aviation Ltd. | IATA: 8V, Callsign: Astral Cargo, IATA Prefix: 485, | EAK | AVCODES |
| 2551 | ACP | Astral Aviation | IATA: 8V | | ICAO1 |
| 2552 | ACPA | ACROPOLIS TRANSPORTATION SERVICES I | | | SCAC3 |
| 2553 | ACPB | ATHENS CAPE COMPANIA NAVIERA SA | | | SCAC3 |
| 2554 | ACPC | ALLIED COMMERCIAL PRODUCTS INC | | | SCAC3 |
| 2555 | ACPD | AIR CARGO PICK-UP AND DELIVERY SERV | | | SCAC3 |
| 2556 | ACPE | ARAB COMMERCIAL ENTERPRISES (ACE TR | | | SCAC3 |
| 2557 | ACPF | AIR CAPITAL INTERNATIONAL | | | SCAC3 |
| 2558 | ACPH | AIR CAPITOL MOBILE HOME TRANSPORTIN | | | SCAC3 |
| 2559 | ACPI | ACME PREMIUM SUPPLY CORP | | | SCAC3 |
| 2560 | ACPJ | A C D C TRUCK LEASING | | | SCAC3 |
| 2561 | ACPJ | A CONTAINER TRANSPORT | | | SCAC4 |
| 2562 | ACPK | A-ONE (A-1) CREATIVE PACKAGING CORP | | | SCAC3 |
| 2563 | ACPL | ACCOMPLISHED MOVERS INC | | | SCAC3 |
| 2564 | ACPL | AL-CA-POL LOGISTICS INC | | | SCAC4 |
| 2565 | ACPM | A-COMPASS MOVERS INC | | | SCAC3 |
| 2566 | ACPM | ALLIANCE CONCRETE PUMPS INC | | | SCAC4 |
| 2567 | ACPN | ALL-CAL TRANSPORTATION INC | | | SCAC3 |
| 2568 | ACPO | AUTO CITY PIGGYBACK INC | | | SCAC3 |
| 2569 | ACPO | ACE PYRO LLC | | | SCAC4 |
| 2570 | ACPP | ACTION TRANSPORTATION SERVICES INC | | | SCAC3 |
| 2571 | ACPP | ACAPULCO POOLS | | | SCAC4 |
| 2572 | ACPQ | A C T TRUCKING CORP | | | SCAC3 |
| 2573 | ACPQ | ACTION IMPORTS INC | | | SCAC4 |
| 2574 | ACPR | ACCURATE PAPER RECYCLING CORP | | | SCAC3 |
| 2575 | ACPS | ALL COVER PORTABLE SYSTEMS | | | SCAC4 |
| 2576 | ACPT | ACE TRANSPORT LTD | | | SCAC3 |
| 2577 | ACPU | CARDIGAS | | | SCAC4 |
| 2578 | ACPV | AIR CAPITOL TRANSFER & STORAGE INC | | | SCAC3 |
| 2579 | ACPV | AGROCOOPERATIVE LTD | | | SCAC4 |
| 2580 | ACPW | A-CORP INC | | | SCAC3 |
| 2581 | ACPW | AGLAND CO OP INC | | | SCAC4 |
| 2582 | ACPX | Union Tank Car Co. | added 10/2003; 7/2005 | | NAKINA |
| 2583 | ACPX | BP Products North America Inc. | added 1/2003; eliminated 10/2003 | | NAKINA |
| 2584 | ACPX | Amoco Oil Co. | added 1/1998; 7/2000; eliminated 1/2003 | | NAKINA |
| 2585 | ACPX | CGTX Inc. | added 1/1993; 1/1994; eliminated 10/1997 | | NAKINA |
| 2586 | ACPX | Amoco Canada Petroleum Co., Ltd. | added 1/1981; 1/1985; eliminated 1/1993 | | NAKINA |
| 2587 | ACPX | Amoco Canada Petroleum Co., Ltd. | added 1/81; eliminated 1/93 | | NRHS |
| 2588 | ACPX | CGTX Inc. | added 1/93; 1/94; eliminated 10/97 | | NRHS |
| 2589 | ACPX | Amoco Oil Co. | added 1/98; 7/2000 | | NRHS |
| 2590 | ACPX | *AMOCO CANADA PETROLEUM COMPANY LTD. | | | PWRC |
| 2591 | ACPX | *BP PRODUCTS NORTH AMERICA INC. [CGTX,INC.; AMOCO OIL CO.] | | | PWRC |
| 2592 | ACPX | +UNION TANK CAR CO. | | | PWRC |
| 2593 | ACPX | Amoco Canada Petroleum (Union Tank Car Lines) | | | RSRV |
| 2594 | ACPX | UNION TANK CAR COMPANY | | | SCAC4 |
| 2595 | ACPZ | *AMERICAN CONCRETE PRODUCTS COMPANY | | | PWRC |
| 2596 | ACPZ | *AMERICAN CAST IRON PIPE CO. | | | PWRC |
| 2597 | ACPZ | American Concrete Products | | | RSRV |
| 2598 | ACPZ | AMERICAN CONCRETE PRODUCTS COMPANY | | | SCAC4 |
| 2599 | ACQ | Aero Continente | IATA: N6, Callsign: Aero Continente, IATA Prefix: 929, Name changed to Nuevo Continente, S.A. Operting License was revoked by Chilean Avition officials on 10 June 2002. | PE | AVCODES |
| 2600 | ACQ | Nuevo Continente, S.A. | IATA: N6, Callsign: Aero Continente, IATA Prefix: 929, Name changed from Aero Continente | PE | AVCODES |
