| 1 | SU | Aeroflot Russian Airlines | ICAO: AFL, Callsign: Aeroflot, IATA Prefix: 555, Name changed to JSC Aeroflot - Russian Airlines. Name changed from Aeroflot - Russian International Airlines | RUS | AVCODES |
| 2 | SU | Aeroflot Cargo | ICAO: RCF, IATA Prefix: 507, Founded on 26 October 2005. Commenced operations on 19 April 2006. Ceased operations on 01 December 2009. | RUS | AVCODES |
| 3 | SU | PJSC "Aeroflot" | ICAO: AFL, Callsign: Aeroflot, IATA Prefix: 555, Name changed from JSC Aeroflot - Russian Airlines w.e.f. 14 August 2015. Name changed from Aeroflot Russian Airlines. Name changed from Aeroflot - Russian International Airlines | RUS | AVCODES |
| 4 | SU | | Other trams, busses, trucks, cars from the former Sovietunion | SU | TRAFFIC |
| 5 | SUA | Aviation Associates, Inc. d/b/a Eastern Metro Express | Callsign: Sunbird, | USA | AVCODES |
| 6 | SUA | Silesia Air J.S.C. | Callsign: Aie Silesia, | CZ | AVCODES |
| 7 | SUA | Silesia Air | | | ICAO1 |
| 8 | SUAB | Southern Alabama R.R. Co., Inc. | added 1/1989; eliminated 10/1991; 1/1994-7/2005 | | NAKINA |
| 9 | SUAB | Southern Alabama R.R. Co., Inc. | added 1/89; eliminated 10/91; 1/94-7/2000 | | NRHS |
| 10 | SUAB | SOUTHERN ALABAMA RAILROAD COMPANY | | | PWRC |
| 11 | SUAB | Southern Alabama Railroad | | | RSRV |
| 12 | SUAD | SUPERIOR ASSEMBLY AND DISTRIBUTION CENTER, INC | | | SCAC1 |
| 13 | SUAG | SUER NAKLIYAT LOJISTIK | | | SCAC4 |
| 14 | SUAH | SUPERIOR GLOBAL LOGISTICS | | | SCAC4 |
| 15 | SUAL | SALCEDO URBINA, ALFREDO LUIS | | | SCAC4 |
| 16 | SUAM | SUPERIOR TACKLE | | | SCAC4 |
| 17 | SUAO | SUPREME TRUCKING LTD | | | SCAC4 |
| 18 | SUAR | SUAREZ EXPORTA HILARIA MARIBEL SUAR | | | SCAC4 |
| 19 | SUAR | Danisco Sugar Arlöv | | SE | VKM |
| 20 | SUAS | SURVIVAL SYSTEMS LIMITED | | | SCAC4 |
| 21 | SUAS | Sokolovská uhelná, a.s. | | CZ | VKM |
| 22 | SUAY | SUNRISE SHIPPING AGENCY, INC. | | | SCAC4 |
| 23 | SUB | Suburban Air Freight, Inc. | Callsign: Sub Air, | USA | AVCODES |
| 24 | SUB | Suburban Air Freight | | | ICAO1 |
| 25 | SUB | STATE SUBSIDY | | | PWRC |
| 26 | SUBA | SUPERIOR HARVEST FOODS INC | | | SCAC4 |
| 27 | SUBBUS | Miêdzygminne Przedsiêbiorstwo Komunikacyjne "SubBus" Sp. z o.o. | City: Nowa Sól | PL | TRAFFIC |
| 28 | SUBF | SUNBIRD TRANSPORT INC | | | SCAC4 |
| 29 | SUBI | SPORT SYSTEMS UNLIMITED CORP | | | SCAC4 |
| 30 | SUBJ | SUPERIOR LOGISTICA SA DE CV | | | SCAC4 |
| 31 | SUBK | SEELY SPRUILL OIL CO INC | | | SCAC4 |
| 32 | SUBL | SEGURA VALLEJO, ADAN | | | SCAC4 |
| 33 | SUBM | SUPERIOR INTERNATIONAL | | | SCAC4 |
| 34 | SUBN | SUNRISE TRUCK BROKERAGE INC | | | SCAC4 |
| 35 | SUBS | SUBSEA SEVEN 7 (US) LLC | | | SCAC4 |
| 36 | SUBT | Subotica Trans | | SR | TRAFFIC |
| 37 | SUBU | COMMISSARI | | | SCAC4 |
| 38 | SUBURB | Suburban Transit | A Coach USA company | USA | TRAFFIC |
| 39 | SUBV | STANDISH AUTO & TRAILER SALES | | | SCAC4 |
| 40 | SUBW | SUBURBAN SAME DAY DELIVERY | | | SCAC4 |
| 41 | SUBX | Doxol Gas Supply, Inc. | added 7/1961; eliminated 4/1965 | | NAKINA |
| 42 | SUBX | North American Car Corp. | added 4/1965; 7/1965-1/1975; eliminated 1/1977 | | NAKINA |
| 43 | SUBX | Doxol Gas Supply, Inc. | eliminated 4/65 | | NRHS |
| 44 | SUBX | North American Car Corp. | added 4/65; 7/65-1/75; eliminated 1/77 | | NRHS |
| 45 | SUBX | DOXOL GAS SUPPLY (NORTH AMERICAN CAR CORP.) | | | PWRC |
| 46 | SUC | Suramericana de Aviacion, C.A. (Surca) | Callsign: Surca, | YV | AVCODES |
| 47 | SUC | Sunfly, S.L. | | E | AVCODES |
| 48 | SUCAQ | SUCRE AQUITAINE | | FR | VKM |
| 49 | SUCB | SOUTHERN CAL TRANSPORT INC | | | SCAC4 |
| 50 | SUCC | SUNCO CARRIERS INC | | | SCAC4 |
| 51 | SUCC | Surray County Council | | GB | TRAFFIC |
| 52 | SUCG | SUPER CARTAGE COMPANY, INC | | | SCAC1 |
| 53 | SUCL | SUNICE CARGO LOGISTICS | | | SCAC4 |
| 54 | SUCM | SUPPLY CHAIN MANAGEMENT INC | | | SCAC4 |
| 55 | SUCN | SUTTON SYSTEM SALES INC | | | SCAC4 |
| 56 | SUCP | SUPREME CARRIERS INC | | | SCAC4 |
| 57 | SUCQ | SU CARGA EXPRESS | | | SCAC4 |
| 58 | SUCS | SUNHOUSE PETROLEUM LLC | | | SCAC4 |
| 59 | SUCU | SITAL SRL | | I | BIC |
| 60 | SUCV | SUN CITY TOWING & RECOVERY LP | | | SCAC4 |
| 61 | SUCX | Merchants Despatch Transportation Corp. | added 10/1954; 10/1957-4/1970; eliminated 7/1972 | | NAKINA |
| 62 | SUCX | Merchants Despatch Transportation Corp. | 10/57-4/70 | | NRHS |
| 63 | SUCX | MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 64 | SUD | Sudan Airways Co. Ltd. | IATA: SD, Callsign: Sudanair, IATA Prefix: 200, | SUD | AVCODES |
| 65 | SUD | Sudan Airways | IATA: SD | | ICAO1 |
| 66 | SUD | Südbahn | | A | TRAFFIC |
| 67 | SUDA | SUNLAND DISTRIBUTION OF FLORIDA INC | | | SCAC4 |
| 68 | SUDB | Greater Sudbury Transit | | CDN | TRAFFIC |
| 69 | SUDC | COLUMBUS LINE, INC. | | | PWRC |
| 70 | SUDD | SUDDATH RELOCATION SYSTEMS OF | | | SCAC4 |
| 71 | SUDG | SUN DOG TRUCKING INC | | | SCAC4 |
| 72 | SUDH | SUDDATH RELOCATION SYSTEMS OF NORTH | | | SCAC4 |
| 73 | SUDI | SUREFIRE CONSULTING LLC | | | SCAC4 |
| 74 | SUDL | SUDDATH VAN LINES D/B/A SUDATH RELO | | | SCAC4 |
| 75 | SUDO | SKYRAIL SYSTEMS USA INC | | | SCAC4 |
| 76 | SUDR | STUDDARD, JAMES B TRANSFER & STORAG | | | SCAC4 |
| 77 | SUDT | SUDDATH TRANSPORTATION SERVICES, IN | | | SCAC4 |
| 78 | SUDU | MAERSK A/S | | DK | BIC |
| 79 | SUDU | COLUMBUS LINE, INC. | | | PWRC |
| 80 | SUDU | Columbus Line | | | RSRV |
| 81 | SUDU | SUD HAMBURG/COLUMBUS LINE | | | SCAC1 |
| 82 | SUDU | HAMBURG SUED | | | SCAC4 |
| 83 | SUE | Aerolineas Del Sureste, S.A. | Callsign: Aerosureste, | MEX | AVCODES |
| 84 | SUE | Su Airlines | Callsign: Su Airlines, | WAG | AVCODES |
| 85 | SUE | Aerolineas Del Sureste | | | ICAO1 |
| 86 | SUEA | SANTOKU SENPAKU CO LTD | | | SCAC4 |
| 87 | SUED | SUEDART | | | SCAC4 |
| 88 | SUEF | SURFACE 2 AIR LOGISTICS | | | SCAC4 |
| 89 | SUEG | STRASBURGER LOGISTICS LLC | | | SCAC4 |
| 90 | SUEK | SURERIDE INC | | | SCAC4 |
| 91 | SUEL | SUECO FUEL OIL INC | | | SCAC4 |
| 92 | SUEN | SUNSET TRANSPORTATION INC | | | SCAC4 |
| 93 | SUEP | SUPERIOR LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 94 | SUES | SUTTLES TRUCK LEASING INC | | | SCAC4 |
| 95 | SUEV | SU TRANSPORTE SA DE CV | | | SCAC4 |
| 96 | SUEW | SUMERIAN FORWARDING | | | SCAC4 |
| 97 | SUF | Sun Air (Pacific) Limited. | IATA: PI, Callsign: Sunflower, IATA Prefix: 252, Designator PI recalled by IATA. Name changed from Sunflower Airlines Ltd. IATA designator changed from 2S | FJI | AVCODES |
| 98 | SUF | Sunflower Airlines Ltd. | IATA: PI, Callsign: Sunflower, IATA Prefix: 252, Name changed to Sun Air (Pacific) Limited. IATA designator changed from 2S | FJI | AVCODES |
| 99 | SUF | Sunflower Airlines Ltd. | IATA: 2S, Callsign: Sunflower, IATA designator changed to PI | FJI | AVCODES |
| 100 | SUF | Sun Air (Fiji) | IATA: PI | | ICAO1 |
