| 1 | SN | Delta Air Transport N.V. | ICAO: DAT, Callsign: Deltair, IATA Prefix: 082, Name changed to SN Brussels Airlines. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 2 | SN | SABENA | ICAO: SAB, Callsign: Sabena, IATA Prefix: 082, Ceased operations on 07 November 2001. Codes transferred to Delta Air Transport | B | AVCODES |
| 3 | SN | Delta Air Transport N.V. d/b/a SN Brussels Airlines | ICAO: DAT, Callsign: Estail, IATA Prefix: 082, Name changed from Delta Air Transport N.V. w.e.f. 15 February 2002. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 4 | SN | Delta Air Transport N.V. t/a Brussels Airlines | ICAO: DAT, Callsign: Estail, IATA Prefix: 082, Name changed from Delta Air Transport N.V. d/b/a SN Brussels Airlines. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 5 | SN | Brussels Airlines N.V. | ICAO: DAT, Callsign: Estail, IATA Prefix: 082, ICAO Desginator changed to BEL. Name changed from Delta Air Transport N.V. t/a Brussels Airlines. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 6 | SN | Brussels Airlines N.V. | ICAO: BEL, Callsign: Beeline, IATA Prefix: 082, ICAO Desginator changed from DAT. Name changed from Delta Air Transport N.V. t/a Brussels Airlines. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 7 | SN | Brussels Airlines N.V. | ICAO: DAT, Callsign: Bee-Line, IATA Prefix: 082, ICAO Desginator changed to BEL. Name changed from Delta Air Transport N.V. t/a Brussels Airlines. IATA designator changed from QG, ICAO designator changed from DAT | B | AVCODES |
| 8 | SN | Salina Northern R.R. Co. | 7/1923 | | NAKINA |
| 9 | SN | Sacramento Northern Ry. | 10/1957-1/1980; eliminated 10/1987 | | NAKINA |
| 10 | SN | Union Pacific R.R. Co. | added 10/1987; eliminated 4/1988 | | NAKINA |
| 11 | SN | Sacramento Northern Ry. | 10/57-1/80; eliminated 10/87 | | NRHS |
| 12 | SN | Union Pacific R.R. Co. | added 10/87; eliminated 4/88 | | NRHS |
| 13 | SN | *SALINA NORTHERN RAILROAD CO. | | | PWRC |
| 14 | SN | *UNION PACIFIC RAILROAD CO. [SACRAMENTO NORTHERN RAILWAY] | | | PWRC |
| 15 | SN | Sacramento Northern Railway | | | RSRV |
| 16 | SN | Sovietische Flotte/Soviet Navy | | SU | TRAFFIC |
| 17 | SNA | Senator Aviation Charter GmbH | Callsign: Senator, Ceased operations in 2017. | D | AVCODES |
| 18 | SNA | LogicPaq Btd, s.r.l. d/b/a Sky Cana | IATA: RD, Callsign: Cana, IATA Prefix: 440, | DOM | AVCODES |
| 19 | SNA | Senator Aviation Charter | | | ICAO1 |
| 20 | SNA | Sacramento Northern Ry. | Real: SN | USA | TRAFFIC |
| 21 | SNAF | SIX TWO NINE NINE FOUR ZERO SEVEN ( | | | SCAC4 |
| 22 | SNAF | Senegalese Air Force | Armée de l'Air Sénégalaise, 1961 - | SN | TRAFFIC |
| 23 | SNAJ | Skynet Asia Airways / Solaseed Air | Real: SNJ | J | TRAFFIC |
| 24 | SNAL | SANGHA, A TRUCKING LTD | | | SCAC4 |
| 25 | SNALL | Snälltaget AB | | S | TRAFFIC |
| 26 | SNAM | SEVEN BROTHERS TRANSPORTATION LLC | | | SCAC4 |
| 27 | SNAN | SNARE SHOP, THE | | | SCAC4 |
| 28 | SNAP | SANDRI, A R INC | | | SCAC4 |
| 29 | SNAR | SUNRISE AG SERVICE COMPANY | | | SCAC4 |
| 30 | SNAT | SPANISH & AMERICAN TRANSPORTATION I | | | SCAC4 |
| 31 | SNAU | SMARTLAGER NORGE AS | | N | BIC |
| 32 | SNAU | SMARTLAGER NORGE AS | | | SCAC4 |
| 33 | SNAV | SEASIDE NAVIGATION (USA) INC | | | SCAC4 |
| 34 | SNAX | Sociedad Nacional de Productores de Alcohol | 1/1946-1/1975; eliminated 10/1975 | | NAKINA |
| 35 | SNAX | Sociedad Nacional de Productores de Alcohol | 1/52-1/75 | | NRHS |
| 36 | SNAX | SOCIEDAD NACIONAL DE PRODUCTORES DE ALCOHOL | | | PWRC |
| 37 | SNAY | STORMIN TRANSPORT LLC | | | SCAC4 |
| 38 | SNB | Sterling European Kommanditaktieselskab | IATA: NB, Callsign: Sterling, IATA Prefix: 373, Name changed to Sterling Airlines A/S. Formerly Sterling Airlines A/S | DK | AVCODES |
| 39 | SNB | Sterling Airlines A/S | IATA: NB, Callsign: Sterling, IATA Prefix: 373, Ceased operations on 29 October 2008. Name changed from Sterling European Kommanditaktieselskab. Formerly Sterling Airlines A/S | DK | AVCODES |
| 40 | SNB | Sterling Airlines | IATA: NB | | ICAO1 |
| 41 | SNB | Svendborg - Nyborg Banen (Hesselagerbanen) | 1897 - 1964 | DK | jernbanen.dk |
| 42 | SNB | Svendborg - Nyborg Banen (Hesselagerbanen) | 1897 - 1964 | DK | TRAFFIC |
| 43 | SNBA | STEINMAN TRANSPORTATION LIMITED | | | SCAC4 |
| 44 | SNBB | SHANNON, B & B TRUCKING | | | SCAC4 |
| 45 | SNBD | SCHNEIDER NATIONAL CARRIERS INC (BR | | | SCAC4 |
| 46 | SNBE | SERMAPA | | | SCAC4 |
| 47 | SNBF | SNB FREIGHT LLC | | | SCAC4 |
| 48 | SNBG | SKYLINE NATIONAL BROKERAGE INC | | | SCAC4 |
| 49 | SNBH | SLOAN, ROBERT A INC | | | SCAC4 |
| 50 | SNBI | SUPER NATIONAL BERRAS (SNB) INC | | | SCAC4 |
| 51 | SNBK | SUNBURST TRUCK LINES INC | | | SCAC4 |
| 52 | SNBL | Sioux City & New Orleans Barge Line | 1/1975-7/2005 | | NAKINA |
| 53 | SNBL | Sioux City & New Orleans Barge Line | 1/75-7/2000 | | NRHS |
| 54 | SNBL | SIOUX CITY & NEW ORLEANS BARGE LINE | | | PWRC |
| 55 | SNBL | Sioux City and New Orleans Barge Line | | | RSRV |
| 56 | SNBL | SNOBELEN, TROY HOLDINGS LTD | | | SCAC4 |
| 57 | SNBM | SANTANA, HECTOR AND ANTONIO VACA | | | SCAC4 |
| 58 | SNBN | SINBANALI SHIPPING INC | | | SCAC4 |
| 59 | SNBO | SCHNEIDER NATIONAL BULK CARRIERS IN | | | SCAC4 |
| 60 | SNBP | S & B TRANSPORTATION INC | | | SCAC4 |
| 61 | SNBQ | STALLION BUS & TRANSIT | | | SCAC4 |
| 62 | SNBR | SUNBURST TRUCKING INC | | | SCAC4 |
| 63 | SNBS | SANCHEZ BAHENA, SERVANDO | | | SCAC4 |
| 64 | SNBT | SUNBURST TRANSPORTATION LLC | | | SCAC4 |
| 65 | SNBU | SINOTRANS CONTAINER LINES CO.,LTD. | | PRC | BIC |
| 66 | SNBU | SINOTRANS CONTAINER LINES CO LTD | | | SCAC4 |
| 67 | SNBW | SMAIL TRUCKING LLC | | | SCAC4 |
| 68 | SNBX | Schneider Brewing Co. | 7/1935 | | NAKINA |
| 69 | SNBZ | SCHNEODER NATIONAL BULK CARRIERS IN | | | SCAC4 |
| 70 | SNC | Air Cargo Carriers, Inc. | IATA: 2Q, Callsign: Night Cargo, IATA Prefix: 883, Designator 2Q reinstated by IATA. IATA designator changed from 3U* | USA | AVCODES |
| 71 | SNC | Air Cargo Carriers, Inc. | IATA: 3U, Callsign: Night Cargo, Designator 3U* recalled by IATA | USA | AVCODES |
| 72 | SNC | Air Cargo Carriers, Inc. | IATA: 3U, Callsign: Night Cargo, IATA designator changed to 2Q. Designator 3U* reinstated by IATA | USA | AVCODES |
| 73 | SNC | Apollo Airways, Inc. | Callsign: Sonic, | USA | AVCODES |
| 74 | SNC | Air Cargo Carriers, LLC. | IATA: 2Q, Callsign: Night Cargo, Designator 2Q reinstated by IATA. IATA designator changed from 3U* | USA | AVCODES |
| 75 | SNC | Air Cargo Carriers | IATA: 2Q | | ICAO1 |
| 76 | SNC | SEATTLE & NORTH COAST RAILROAD | | | PWRC |
| 77 | SNC | Saratoga & North Creek Railway | | USA | TRAFFIC |
| 78 | SNCA | SANTOS CAMACHO, FLORENCIO | | | SCAC4 |
| 79 | SNCB | | | B | TRAFFIC |
| 80 | SNCB | Société Nationale des Chemins de fer Belges | | BE | VKM |
| 81 | SNCC | SUN COAST TRANSPORT CORPORATION | | | SCAC4 |
| 82 | SNCD | SNOW, CLAYTON D INC | | | SCAC4 |
| 83 | SNCE | SAUNACORE | | | SCAC4 |
| 84 | SNCF | SCHNEIDER NATIONAL CARRIERS INC-VAR | | | SCAC4 |
| 85 | SNCF | | | F | TRAFFIC |
| 86 | SNCF | Société Nationale des Chemins de Fer | | FR | VKM |
| 87 | SNCFA | Société Nationale des Chemins de Fer Algériens | | DZ | TRAFFIC |
| 88 | SNCFFB | SNCF Fret Benelux | | | TRAFFIC |
| 89 | SNCFT | | | TN | TRAFFIC |
| 90 | SNCFT | Société Nationale des Chemins de Fer Tunésiens | | TN | VKM |
| 91 | SNCG | STONE CENTRE GRANITE & MARBLE | | | SCAC4 |
| 92 | SNCI | S & C TRANSPORT INC | | | SCAC4 |
| 93 | SNCK | SCHNEIDER NATIONAL CARRIERS INC (TR | | | SCAC4 |
| 94 | SNCL | SUNICE LOGISTICS INC | | | SCAC4 |
| 95 | SNCM | SUNLINE COMMERCIAL CARRIERS INC | | | SCAC4 |
| 96 | SNCO | Seaport Navigation | 1/1975-1/1980 | | NAKINA |
| 97 | SNCO | Seaport Navigation | 1/75-1/80 | | NRHS |
| 98 | SNCO | SEAPORT NAVIGATION | | | PWRC |
| 99 | SNCO | SPRAY NINE CORPORATION | | | SCAC4 |
| 100 | SNCQ | STILLSON OIL CO INC | | | SCAC4 |
