| 2701 | SECG | SOUND FUEL LLC | | | SCAC4 |
| 2702 | SECK | SECAS TRUCKING | | | SCAC4 |
| 2703 | SECN | SEELEY AND ARNILL CONSTRUCTION | | | SCAC4 |
| 2704 | SECO | SEWCO INC. | | | PWRC |
| 2705 | SECO | SOUTHEAST COOPERATIVE SERVICE COMPA | | | SCAC4 |
| 2706 | SECO | SECO Rail | | F | TRAFFIC |
| 2707 | SECR | SCREAMIN EAGLE CARTAGE INC | | | SCAC4 |
| 2708 | SECS | EUROTAINER S.A.R.L. | | | PWRC |
| 2709 | SECS | EUROTAINER S.A.R.L | | | SCAC3 |
| 2710 | SECT | SELECT TRANSPORTATION SERVICES DIVI | | | SCAC4 |
| 2711 | SECU | EUROTAINER SA | | F | BIC |
| 2712 | SECU | EUROTAINER SA | | | SCAC4 |
| 2713 | SECV | SUPERIOR TRANSPORT INC | | | SCAC4 |
| 2714 | SECX | Southern Extract Co. | 8/1920-4/1938 | | NAKINA |
| 2715 | SECX | South-East Coal Co. | added 1/1975; 1/1975-1/1980; eliminated 7/1993; 1/1994 (not listed) | | NAKINA |
| 2716 | SECX | General Electric Railcar Services Corp. | eliminated 1/2000 | | NAKINA |
| 2717 | SECX | General Electric Rail Services Corp. | added 1/2000; 7/2000 (not listed); eliminated 10/2001 | | NAKINA |
| 2718 | SECX | Southern Extract Co. (The Mead Corp.) | Apr-38 | | NRHS |
| 2719 | SECX | South-East Coal Co. | added 1/75; 1/75-1/80; eliminated 7/93; 1/94 | | NRHS |
| 2720 | SECX | General Electric Railcar Services Corp. | eliminated 1/2000 | | NRHS |
| 2721 | SECX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 2722 | SECX | *SOUTHERN EXTRACT CO. | | | PWRC |
| 2723 | SECX | *(NATX) GENERAL ELECTRIC RAILCAR SERVICES CORP. [SOUTH EAST COAL CO.] | | | PWRC |
| 2724 | SECX | South-East Coal | | | RSRV |
| 2725 | SECX | South-East Coal Co. | | USA | TRAFFIC |
| 2726 | SECY | STEWART TRUCKING | | | SCAC4 |
| 2727 | SED | Sedona Air Center | Callsign: Sedona Air, | USA | AVCODES |
| 2728 | SED | Sedona Air Center | | | ICAO1 |
| 2729 | SEDA | SUPERIOR SUGARDALE MEATS | | | SCAC4 |
| 2730 | SEDB | SP EXPRESS TRANSPORTATION MANAGEMEN | | | SCAC4 |
| 2731 | SEDE | SAMPSON'S CARGO CARRIER | | | SCAC4 |
| 2732 | SEDG | SATURN ELECTRONICS DE MONTERREY SA | | | SCAC4 |
| 2733 | SEDM | STAR EXPRESS DIV OF TWO TWO | | | SCAC4 |
| 2734 | SEDN | SNELSON, RICK & SON INC | | | SCAC4 |
| 2735 | SEDQ | STERLING EDGE INC | | | SCAC4 |
| 2736 | SEDS | SPECIAL ELECTRONICS & DESIGNS INC | | | SCAC4 |
| 2737 | SEDT | SERVICIO EXPRESS DE TIJUANA S DE R | | | SCAC4 |
| 2738 | SEDU | SCHENKER (DEUTSCHLAND) AG | | D | BIC |
| 2739 | SEDU | SCHENKER-BTL (DEUTSCHLAND) AG | | | SCAC4 |
| 2740 | SEDW | STONEARCH LOGISTICS LLC | | | SCAC4 |
| 2741 | SEE | Shaheen Air Cargo (Primate) Limited | Callsign: Shaheen Cargo, IATA Prefix: 587, Ceased operations on 01 August 2018. | PK | AVCODES |
| 2742 | SEE | Shaheen Air Cargo | | | ICAO1 |
| 2743 | SEEA | SPECIALIZED PAVEMENT MARKING, INC | | | SCAC4 |
| 2744 | SEEB | SKI APACHE | | | SCAC4 |
| 2745 | SEEC | SPIRIT ENTERPRISE | | | SCAC4 |
| 2746 | SEED | SEEDS 2000 INC | | | SCAC4 |
| 2747 | SEEG | S E TRANSPORT LLC | | | SCAC4 |
| 2748 | SEEJ | SEERY, JIM TRUCKING | | | SCAC4 |
| 2749 | SEEN | SIX TWO FOUR EIGHT EIGHT NINE (6248 | | | SCAC4 |
| 2750 | SEEO | SELECT TRANSPORTATION, INC. | | | SCAC4 |
| 2751 | SEEP | STORM EXPRESS INC | | | SCAC4 |
| 2752 | SEER | SOUTHEASTERN PETROLEUM | | | SCAC4 |
| 2753 | SEES | S E M ENTERPRISES INC | | | SCAC4 |
| 2754 | SEEU | FUGRO GEOSERVICES | | GB | BIC |
| 2755 | SEEU | SEACORE LTD | | | SCAC4 |
| 2756 | SEEV | SPECIAL EVENT TRANSPORTATION INC | | | SCAC4 |
| 2757 | SEEW | SEEMA | | | SCAC4 |
| 2758 | SEEY | SOUTHEASTERN ENERGY CORPORATION | | | SCAC4 |
| 2759 | SEF | Aero Servicios Ejecutivas Del Pacifico, S.A. de C.V. | Callsign: Servipacifico, | MEX | AVCODES |
| 2760 | SEF | Aero Servicios Ejecutivas Del Pacifico | | | ICAO1 |
| 2761 | SEFA | SCANDIA FOOD PRODUCTS | | | SCAC4 |
| 2762 | SEFB | SPEED E FURNITURE DELIVERY | | | SCAC4 |
| 2763 | SEFC | SEACOAST TRANSPORTATION LLC | | | SCAC4 |
| 2764 | SEFE | SOUTHEAST FARMERS ELEVATOR COOP | | | SCAC4 |
| 2765 | SEFEPA | Servicios Ferroviarios Patagónico | Ferrocarriles Patagónicos -> Roca division of Ferrocarriles Argentinos -> Servicios Ferroviarios Patagónico. Popular name: Tren Patagónico. | RA | TRAFFIC |
| 2766 | SEFG | SENECA FREIGHT LINES INC | | | SCAC4 |
| 2767 | SEFI | SEVEN EIGHT FIVE THREE EIGHT ZERO S | | | SCAC4 |
| 2768 | SEFL | SOUTHEASTERN FREIGHT LINES, INC | | | SCAC1 |
| 2769 | SEFL | SOUTHEASTERN FREIGHT LINES | | | SCAC4 |
| 2770 | SEFM | SECORD FARMS LLC | | | SCAC4 |
| 2771 | SEFN | SEAFREIGHT LINE | | | SCAC1 |
| 2772 | SEFN | SEAFREIGHT LINE LTD | | | SCAC4 |
| 2773 | SEFO | SOUTH EAST LOGGING LTD | | | SCAC4 |
| 2774 | SEFP | SOUTH EAST FUEL TRANSPORT CORP | | | SCAC4 |
| 2775 | SEFQ | SEAFLET INC | | | SCAC4 |
| 2776 | SEFR | SEFAR PRINTING SOLUTIONS | | | SCAC4 |
| 2777 | SEFS | SEFEROGLU SHIPPING AND TRADING COMP | | | SCAC4 |
| 2778 | SEFT | Società Esercizio Ferroviario Turistico | | CH | TRAFFIC |
| 2779 | SEFTA | Societa` Emiliana Ferrovie Tranvie Automobili Modena | | I | TRAFFIC |
| 2780 | SEFU | CROWLEY CARIBBEAN SERVICES LLC | | USA | BIC |
| 2781 | SEFU | Seafreight Line | | | RSRV |
| 2782 | SEFU | SEAFREIGHT LINE LTD | | | SCAC4 |
| 2783 | SEFV | SEA FREIGHT | | | SCAC4 |
| 2784 | SEFW | SEDLACEK, FRANK W INC | | | SCAC4 |
| 2785 | SEFX | North American Rails Leasing Corp. | added 1/1999; 7/2000; eliminated 1/2002; 7/2005 (not listed) | | NAKINA |
| 2786 | SEFX | North American Rails Leasing Corp. | added 1/99; 7/2000 | | NRHS |
| 2787 | SEFX | NORTH AMERICAN RAILS LEASING COPORATION | | | PWRC |
| 2788 | SEFX | North American Rails Leasing Corporation | | | RSRV |
| 2789 | SEFY | S E FREIGHT SYSTEMS INC | | | SCAC4 |
| 2790 | SEG | Eagle International | Callsign: Sen-Eagle, | SN | AVCODES |
| 2791 | SEG | Skyline | | N | AVCODES |
| 2792 | SEG | Eagle International | | | ICAO1 |
| 2793 | SEG | SILVER EAGLE CHARTERS INC | | | SCAC4 |
| 2794 | SEG | SEGECO SRL | | IT | VKM |
| 2795 | SEGB | SEA ANGEL SHIPPING INC | | | SCAC4 |
| 2796 | SEGC | S & E TRUCKING LLC | | | SCAC4 |
| 2797 | SEGF | SEGUIN, FRANCOIS | | | SCAC4 |
| 2798 | SEGH | SERVICIOS ESPECIALES GARCIA SA DE C | | | SCAC4 |
| 2799 | SEGJ | SEPRI EXPRESS INC | | | SCAC4 |
| 2800 | SEGL | SCREAMIN EAGLE TRANSPORT INC | | | SCAC4 |
