# List of airline codes (S)

This is a list of all airline codes. The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.

## Airline codes for airlines beginning with:

* All
* 0–9
* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z

## Codes

Airline codes :
| IATA | ICAO | Airline | Call sign | Country | Comments |
| | OMN | Servicios Aereos Ominia | SERVIOMNIA | Mexico | 2014 |
| | SEN | Servicios de Aviacion Sierra | SERVISIERRA | Mexico | 2014 |
| | SGC | SGC Aviation | SAINT GEORGE | Austria | 2014 |
| | SCJ | Siamjet Aviation | SIAMJET | Thailand | 2014 |
| | SIX | Sixt Rent A Car | DRIVE ORANGE | United States | 2014 |
| | SOG | Solenta Aviation Ghana | | Ghana | 2014 |
| | QSR | SR Jet | SPARKLE ROLL | China | 2014 |
| | KBN | Spiracha Aviation | KABIN | Thailand | 2014 |
| | CBN | Southern Illinois University as "Aviation Flight" | CARBONDALE | United States | Allocated in 2014 |
| | IBG | Springfield Air | ICE BRIDGE | United States | Allocated 2014 |
| | BZQ | Seneca Polytechnic | STING | Canada | Operates as part of the Bachelor of Aviation program. Allocated 2014 |
| | BVV | Spark+ | SPARC | Russia | |
| | SJM | Sino Jet Management | SINO SKY | China | |
| | SCH | Seychelles Airlines | OCEAN BIRD | Seychelles | |
| | BYF | San Carlos Flight Center | BAY FLIGHT | United States | |
| | SXT | Servicios de Taxi Aereos | SERTAXI | Mexico | |
| TR | TGW | Scoot | SCOOTER | Singapore | Former IATA: TZ Former ICAO: SCO; Adopted Tigerair codes after their merger |
| IJ | SJO | Spring Airlines Japan | JEY SPRING | Japan | |
| | SBD | SIBIA Aircompany Ltd | SIBIA | Russia | |
| | SHT | British Airways Shuttle | SHUTTLE | United Kingdom | |
| 6Y | ART | Smartlynx Airlines | SMART LYNX | Latvia | |
| | MYX | SmartLynx Airlines Estonia | TALLINN CAT | Estonia | |
| QS | TVS | Smartwings | SKYTRAVEL | Czech Republic | formerly named Travel Service |
| 7O | TVL | Smartwings Hungary | TRAVEL SERVICE | Hungary | formerly named Travel Service Hungary |
| 3Z | TVP | Smartwings Poland | JETTRAVEL | Poland | formerly named Travel Service Poland |
| 6D | TVQ | Smartwings Slovakia | SLOVAKTRAVEL | Slovakia | formerly named Travel Service Slovakia |
| | DES | Servicios Aereos Especializados Destina | DESTINA | Mexico | |
| | LSV | Slovenian Ministry of Defence | | Slovenia | |
| | FUF | Servicios Aereos Fun Fly | SERVIFUN | Mexico | |
| E3 | VGO | Sabaidee Airways | VIRGO | Thailand | |
| | SAQ | Safe Air Company | | Kenya | |
| | SMU | Sanborn Map Company | SPRINGER | United States | |
| | RBR | Siam Airnet | SIAM AIRNET | Thailand | |
| | SVB | Siavia | SIAVIA | Slovenia | |
| | MHQ | Skargardshavets Helikoptertjanst | HELICARE | Finland | |
| | BIS | Sky Bishek | JUMA AIR | Kyrgyzstan | |
| | SYH | Sky Handling | | Ukraine | |
| GG | KYE | Sky Lease Cargo | SKY CUBE | United States | |
| | KPM | Sky Prim Air | SKY PRIMAIR | Molodva | |
| BQ | SWU | Sky Alps | SKYALPS | Italy | |
| | BSJ | Skybus Jet | SKYBUS JET | Bahamas | |
| GW | SGR | SkyGreece Airlines | SKYGREECE | Greece | Defunct; Ceased operations 27 August 2015 |
| | USW | Special Aviation Works | AKSAR | Uzbekistan | |
| SH | SHA | Sharp Airlines | SHARP | Australia | Uses unregistered ICAO & IATA. |
| N9 | SHA | Shree Airlines | SHREEAIR | Nepal | |
| 7E | AWU | Sylt Air GmbH | SYLT-AIR | Germany | |
| | BDS | South Asian Airlines | SOUTH ASIAN | Bangladesh | |
| OL | SZB | Samoa Air | SAMOA | Samoa | |
| | BEC | State Air Company Berkut | | Kazakhstan | |
| S4 | RZO | SATA International | AIR AZORES | Portugal | |
| SA | SAA | South African Airways | SPRINGBOK | South Africa | |
| | KYD | Sky Messaging | SKYAD | South Africa | |
| | SAB | Sky Way Air | SKY WORKER | Kyrgyzstan | |
| KV | SKV | Sky Regional Airlines | MAPLE | Canada | |
| | SAC | SASCO Airlines | SASCO | Sudan | |
| | SAG | SOS Flygambulans | MEDICAL AIR | Sweden | |
| W7 | SAH | Sayakhat Airlines | SAYAKHAT | Kazakhstan | |
| NL | SAI | Shaheen Air | SHAHEEN AIR | Pakistan | Defunct; Ceased operations on 8 October 2018 |
| MM | SAM | SAM Colombia | SAM | Colombia | Defunct; Ceased operations on 4 October 2010 |
| | SAN | Servicios Aéreos Nacionales (SAN) | AEREOS | Ecuador | Defunct; Ceased operations in 1999 |
| | SAO | Sahel Aviation Service | SAVSER | Mali | |
| | ANX | Secretaria de Marina | SECRETARIA DEMARINA | Mexico | |
| | SAQ | Springbank Aviation | SPRINGBANK | Canada | |
| SK | SAS | Scandinavian Airlines | SCANDINAVIAN | Sweden, Denmark and Norway | |
| | SAV | Samal Air | | Kazakhstan | |
| | SAW | Cham Wing Airlines | SHAMWING | Syrian Arab Republic | |
| SA | SAX | Sabah Air | SABAH AIR | Malaysia | |
| | SAY | Suckling Airways | SUCKLING | United Kingdom | Defunct; Integrated into Loganair in March 2013 |
| | SAZ | Swiss Air-Ambulance | SWISS AMBULANCE | Switzerland | |
| | SBA | SOL Linhas Aéreas | SOL | Brazil | |
| PI | SGU | Sol del Paraguay | SOLPARAGUAYO | Paraguay | Defunct; Ceased operations on 15 July 2011 |
| | SBA | STA-MALI | STA-MALI | Mali | Defunct |
| | SBB | Steinman Aviation | SABER EXPRESS | United States | |
| UG | TUX | Tunisair Express | TUNEXPRESS | Tunisia | |
| | SBF | Seven Bar Flying Service | SEVENAIR | Tunisia | |
| | SBG | Sabre Incorporated | | United States | |
| S7 | SBI | S7 Airlines | SIBERIAN AIRLINES | Russia | |
| | SBL | Sobel Airlines of Ghana | SOBGHANA | Ghana | |
| Q7 | SBM | SkyBahamas | SKY BAHAMAS | Bahamas | Defunct; Ceased operations on 8 July 2019 |
| 4E | SBO | Stabo Air | STABAIR | Zambia | |
| | SBQ | SmithKline Beecham Clinical Labs | SKIBBLE | United States | |
| | SBR | Saber Aviation | FREIGHTER | United States | |
| BB | SBS | Seaborne Airlines | SEABORNE | United States | |
| PV | SBU | St Barth Commuter | BLACK FIN | France | |
| | URJ | Star Air | STARAV | Pakistan | |
| S5 | SDG | Star Air (India) | HISTAR | India | |
| JX | SJX | Starlux Airlines | STARWALKER | Taiwan | |
| | SBZ | Scibe Airlift | SCIBE AIRLIFT | Democratic Republic of the Congo | |
| | AME | Spanish Air Force | AIRMIL | Spain | |
| | SCA | South Central Air | SOUTH CENTRAL | United States | |
| | SCC | SeaCoast Airlines | SEA-COASTER | United States | |
| K5 | SQH | SeaPort Airlines | SASQUATCH | United States | Former airline: Wings of Alaska now part of SeaPort Airlines. Alternative callsign: WINGS (for VFR flights only). Former ICAO code: WAK. |
| YR | SCE | Grand Canyon Scenic Airlines | SCENIC | United States | |
| | SCF | Socofer | SOCOFER | Angola | |
| | SCI | Servicios Aéreos San Cristóbal | SAN CRISTOBAL | Mexico | |
| | SCK | Sky Cam | SKYCAM | France | |
| W3 | SCL | Switfair Cargo | SWIFTAIR | Canada | |
| | SCB | Saigon Capital Aircraft Management | SAIGON | Netherlands | |
| | SCN | South American Airlines | SOUTH AMERICAN | Peru | |
| | AHI | Servicios Aéreos de Chihuahua Aerochisa | AEROCHISA | Mexico | |
| FP | AND | Servicios Aéreos de los Andes | SERVI ANDES | Peru | 2014 |
| | SCP | Scorpio Aviation | SCORPIO | Egypt | |
| | SCQ | OSM Aviation Academy | SCAVAC | Norway, Sweden and San Diego | |
| | SIC | SFS Aviation | SICHART | Thailand | |
| | SCR | Silver Cloud Air | SILVER CLOUD | Germany | |
| | SCS | South African Non Scheduled Airways | SOUTHERN CHARTERS | South Africa | |
| | SCT | SAAB-Aircraft | SAAB-CRAFT | Sweden | |
| | SCV | Servicios Aéreos Del Centro | SACSA | Mexico | |
| SY | SCX | Sun Country Airlines | SUN COUNTRY | United States | |
| | SDA | St. Andrews Airways | SAINT ANDREWS | Canada | |
| | SDB | Sukhoi Design Bureau Company | SU-CRAFT | Russia | |
| | SDC | Sunrise Airlines | SUNDANCE | United States | |
| | SDD | Skymaster Air Taxi | SKY DANCE | United States | |
| | SDE | Air Partners Corp. | STAMPEDE | Canada | |
| | SDF | Sundorph Aeronautical Corporation | SUNDORPH | United States | |
| | SDH | Servicio De Helicopteros | ARCOS | Spain | |
| | SDK | SADELCA Ltda. | SADELCA | Colombia | |
| | SDL | Skydrift | SKYDRIFT | United Kingdom | |
| | SDN | Spirit of Africa Airlines | BLUE NILE | Sudan | |
| | SDU | Sud Airlines | SUD LINES | France | Defunct; Ceased operations in July 2008 |
| | SDV | Servicios Aéreos Del Vaupes | SELVA | Colombia | |
| | SDX | Servicio Tecnico Aero De Mexico | SERVICIO TECNICO | Mexico | |
| | SDZ | Sudan Pezetel for Aviation | SUDANA | Sudan | |
| | SEA | Southeast Air | SOUTHEAST AIR | United States | |
| | SEB | Servicios Aéreos Luce | SERVILUCE | Mexico | |
| | SED | Sedona Air Center | SEDONA AIR | United States | |
| | SEE | Shaheen Air Cargo | SHAHEEN CARGO | Pakistan | |
| | SEH | Sky Express | AIR CRETE | Greece | |
| SG | SEJ | Spicejet | SPICEJET | India | |
| | SEK | Skyjet | SKALA | Kazakhstan | |
| | SEL | Sentel Corporation | SENTEL | United States | |
| | SEO | Selcon Airlines | SELCON AIR | Nigeria | |
| I6 | SEQ | Sky Eyes | SKY EYES | Thailand | |
| | SES | Servicio Aéreo Saltillo | SERVISAL | Mexico | |
| EH | SET | SAETA Air Ecuador | SAETA | Ecuador | Defunct; Ceased operations in February 2000 |
| | SEV | Serair Transworld Press | CARGOPRESS | Spain | |
| | SFA | SEFA | SEFA | France | defunct - absorbed into École Nationale de l'Aviation Civile, with new ICAO code NAK |
| | SFC | Shuswap Flight Centre | SHUSWAP | Canada | |
| | SFE | Sefofane Air Charters | SEFOFANE | Botswana | Rebranded "Wilderness Air" |
| | SFF | Safewings Aviation Company | SWIFTWING | United States | |
| | SFG | Sun Freight Logistics | AERO GULF | Thailand | |
| 7G | SFJ | StarFlyer | STARFLYER | Japan | |
| | SFL | Southflight Aviation | SOUTHFLIGHT | New Zealand | |
| | SFN | Safiran Airlines | SAFIRAN | Iran | |
| | SFP | Safe Air | SAFE AIR | Pakistan | |
| FA | SFR | Safair | CARGO | South Africa | |
| | SFS | Southern Frontier Airlines | SOUTHERN FRONTIER | Canada | |
| | SFT | Skyfreight | SKYFREIGHT | United States | |
| | SFU | Solent Flight | SAINTS | United Kingdom | |
| | SFX | S.K. Logistics | SWAMP FOX | United States | |
| | SGB | Songbird Airways, Inc. | SONGBIRD | United States | Defunct; Ceased operations on 7 February 2017 |
| | SGC | Southern Right Air Charter | SOUTHERNRIGHT | South Africa | |
| | SGD | Skygate International Aviation | AIR BISHKEK | Kyrgyzstan | |
| | SGF | STAC Swiss Government Flights | STAC | Switzerland | |
| | SGH | Servisair | SERVISAIR | United Kingdom | |
| | SGI | Servicios Aéreos Agrícolas | SERAGRI | Chile | |
| | SGK | Skyward Aviation | SKYWARD | Canada | |
| | SGM | Sky Aircraft Service | SIGMA | Netherlands | |
| | SGN | Siam GA | SIAM | Thailand | Defunct; Ceased operations 30 May 2014 |
| | SGP | Sagolair Transportes Ejecutivos | SAGOLAIR | Spain | |
| | SGS | Saskatchewan Government Executive Air Service | SASKATCHEWAN | Canada | |
| | SGT | Skygate | SKYGATE | Netherlands | |
| | SGU | Samgau | RAUSHAN | Kazakhstan | |
| | SGX | Saga Airlines | | Turkey | |
| N5 | SGY | Skagway Air Service | SKAGWAY AIR | United States | |
| | SHB | Shabair | SHABAIR | Democratic Republic of the Congo | |
| | SHC | Sky Harbor Air Service | SKY HARBOR CHEYENNE | United States | |
| | SHD | Sahara Airlines | | Algeria | |
| | SHE | Shell Aircraft | SHELL | United Kingdom | |
| | SHG | Shoprite Group | SHOP AIR | United Kingdom | |
| | SHJ | Sharjah Ruler's Flight | SHARJAH | United Arab Emirates | |
| | SHK | Shorouk Air | | Egypt | |
| | SHL | Samson Aviation | SAMSON | United Kingdom | |
| | SHM | Sheltam Aviation | SHELTAM | South Africa | |
| | SHN | Shaheen Airport Services | SUGAR ALFA | Pakistan | |
| | SHO | Sheremetyevo-Cargo | | Russia | |
| | SHP | Service Aerien Francais | SAF | France | |
| | SHQ | Shanghai Airlines Cargo | SHANGHAI CARGO | China | |
| | SHR | Shooter Air Courier | SHOOTER | Canada | |
| | SHS | Shura Air Transport Services | SHURA AIR | Ethiopia | |
| HZ | SHU | Sakhalinskie Aviatrassy (SAT) | SATAIR | Russia | |
| SP | SAT | SATA Air Acores | SATA | Portugal | |
| 8S | | Scorpio Aviation | | | |
| | SHV | Shavano Air | SHAVANO | United States | |
| | SHW | Shawnee Airline | SHAWNEE | United States | Air South |
| | SHX | Slim Aviation Services | SLIM AIR | Nigeria | |
| ZY | SHY | Sky Airlines | ANTALYA BIRD | Turkey | |
| SQ | SIA | Singapore Airlines | SINGAPORE | Singapore | |
| 5M | SIB | Sibaviatrans | SIBAVIA | Russia | |
| | SIE | Sierra Express | SEREX | United States | |
| SI | SIH | Skynet Airlines | BLUEJET | Ireland | 2001–2004 |
| | SIJ | Seco International | | Japan | |
| 3M | SIL | Silver Airways | SILVER WINGS | United States | |
| | SIL | Servicios Aeronáuticos Integrales | SERVICIOS INTEGRALES | Mexico | |
| | SIM | Star Air | | Sierra Leone | |
| | SIO | Sirio (airline) | SIRIO | Italy | |
| | SIR | Salair | SALAIR | United States | |
| | SIS | Saber Airlines | | Egypt | |
| XS | SIT | SITA | | Belgium | |
| | SIV | Slovenian Armed Forces | SLOVENIAN | Slovenia | |
| | SIW | Sirio Executive | SIRIO EXECUTIVE | Italy | |
| | SJA | Servicios Aéreos Especiales De Jalisco | SERVICIOJAL | Mexico | |
| | SJC | Servicios Ejecutivos Continental | SERVIEJECUTIVO | Mexico | |
| | SJE | Sunair 2001 | SUNBIZ | South Africa | |
| | SJJ | Spirit Aviation | SPIRIT JET | United States | |
| | SJL | Servicios Especiales Del Pacifico Jalisco | SERVICIOS JALISCO | Mexico | |
| | SJT | Swiss Jet | SWISS JET | Switzerland | |
| SJ | SJY | Sriwijaya Air | SRIWIJAYA | Indonesia | |
| ZS | SMY | Sama Airlines | NAJIM | Saudi Arabia | |
| | ALC | Southern Jersey Airways, Inc. | ACOM | United States | |
| | SPS | Spark Shuttle | Spark Shuttle | United States | |
| | SPT | Speed Aviation | SPEED AVIATION | Bangladesh | |
| | SPU | Southeast Airmotive | SPUTTER | United States | |
| | SPV | Servicios Privados De Aviación | SERVICIOS PRIVADOS | Mexico | |
| | SPW | Speedwings | SPEEDWING | Switzerland | |
| | SPX | Spark Express (Glow) | Glow|United States | |
| | SQA | Slovak National Aeroclub | SLOVAK AEROCLUB | Slovakia | |
| SQ | SQC | Singapore Airlines Cargo | SINGCARGO | Singapore | |
| | SQF | Slovak Air Force | SLOVAK AIRFORCE | Slovakia | |
| | SQL | Servicos De Alquiler | ALQUILER | Mexico | |
| | SRA | Sair Aviation | SAIR | Canada | |
| | SRC | Searca | SEARCA | Colombia | |
| FT | SRH | Siem Reap Airways | SIEMREAP AIR | Cambodia | Defunct; Ceased operations on 1 December 2008 |
| SX | SRK | Sky Work Airlines | SKYFOX | Switzerland | |
| SM | SRL | Swedline Express | Starline | Sweden | Ceased operations 2006 |
| | SRL | Servicios Aeronáuticos Aero Personal | SERVICIOS PERSONAL | Mexico | |
| | SRN | Sirair | SIRAIR | Russia | |
| P8 | SRN | SprintAir | SPRINTAIR | Poland | |
| | SRO | Servicios Aéreos Ejecutivos Saereo | SAEREO | Ecuador | |
| | SRQ | Cebgo | BLUE JAY | Philippines | Subsidiary of Cebu Pacific |
| | SRS | Selkirk Remote Sensing | PHOTO CHARLIE | Canada | |
| | SRU | Star Up | STAR-UP | Peru | |
| | SRW | Sarit Airlines | SARIA | Sudan | Currently operates as Badr Airlines with IATA code J4 and ICAO designator BDR |
| | SRX | Sierra Expressway Airlines | SIERRA EX | United States | |
| | SRZ | Strato Air Services | STRATO | South Africa | |
| | SSB | Sasair | SASIR | Canada | |
| | SSC | Southern Seaplane | SOUTHERN SKIES | United States | |
| | SSD | Star Service International | STAR SERVICE | France | |
| | SSE | Servicios Aéreos Sunset | SUNSET | Mexico | |
| D2 | SSF | Severstal Air Company | SEVERSTAL | Russia | |
| | SSG | Slovak Government Flying Service | SLOVAK GOVERNMENT | Slovakia | |
| VD | BBB | SwedJet Airways | BLACKBIRD | Sweden | |
| | SSK | Skystar International | SKYSTAR | United States | |
| | SSO | Special Scope Limited | DOPE | United Kingdom | |
| | SSP | Starspeed | STARSPEED | United Kingdom | |
| QF | SSQ | Sunstate Airlines | SUNSTATE | Australia | Uses IATA of parent QANTAS. |
| | SSR | Sardinian Sky Service | SARDINIAN | Italy | |
| | SSS | SAESA | SAESA | Spain | |
| | SST | Sunwest Airlines | SUNFLIGHT | Canada | |
| | SSU | SASCA | SASCA | Venezuela | |
| 5G | SSV | Skyservice Airlines | SKYTOUR | Canada | defunct |
| | SSW | Streamline Aviation | STREAMLINE | United Kingdom | |
| | SSY | Sky Aviation | SIERRA SKY | Sierra Leone | |
| | SSZ | Specsavers Aviation | SPECSAVERS | United Kingdom | |
| | STA | Star Aviation | STAR | United Kingdom | |
| | STB | Status-Alpha Airline | STATUS-ALPHA | Ukraine | |
| | STC | Stadium City Limited | STADIUM | United Kingdom | |
| | STD | Servicios De Aerotransportacion De Aguascalientes | AERO AGUASCALINETES | Mexico | |
| | STE | Semitool Europe | SEMITRANS | United Kingdom | |
| | STF | SFT-Sudanese Flight | | Sudan | |
| | STG | Sedalia, Marshall, Boonville Stage Line | STAGE | United States | |
| | STH | South-Airlines | | Armenia | |
| | STI | Sontair | SONTAIR | Canada | |
| | STJ | Sella Aviation | STELLAVIA | Netherlands | |
| RE | STK | Stobart Air | STOBART | Ireland | Defunct; Ceased operations on 12 June 2021 |
| | STL | Stapleford Flight Centre | STAPLEFORD | United Kingdom | |
| | STO | Streamline Ops | SLOPS | Russia | |
| | STQ | Star Air | STERA | Indonesia | |
| FS | STU | Servicios de Transportes Aéreos Fueguinos | FUEGUINO | Argentina | ICAO and call sign not current |
| | STU | Star African Air | STARSOM | Somali Republic | |
| | SUU | Star West Aviation | SUNSTAR | United States | |
| | STV | Saturn Aviation | SATURN | United States | |
| | STW | South West Air Corporation | SIERRA WHISKEY | Philippines | |
| | STX | Stars Away Aviation | STARSAWAY | South Africa | |
| | STY | Styrian Airways | STYRIAN | Austria | |
| | SUA | Silesia Air | AIR SILESIA | Czech Republic | |
| | SUB | Suburban Air Freight | SUB AIR | United States | |
| SD | SUD | Sudan Airways | SUDANAIR | Sudan | |
| PI | SUF | Sun Air (Fiji) | SUNFLOWER | Fiji | |
| LW | FDY | Sun Air International | FRIENDLY | United States | |
| | SUG | Sunu Air | SUNU AIR | Senegal | |
| | SUH | Sun Light | LIGHT AIR | Kyrgyzstan | |
| | SUI | Swiss Air Force | SWISS AIR FORCE | Switzerland | |
| | SUK | Superior Aviation Services | SKYCARGO | Kenya | |
| | SUM | State Unitary Air Enterprise | SUMES | Russia | |
| | SUR | Sun Air | | Egypt | |
| EZ | SUS | Sun-Air of Scandinavia | SUNSCAN | Denmark | |
| | URF | Surf Air | SURF AIR | United States | |
| | SUT | Sistemas Aeronauuticos 2000 | SISTEMAS AERONAUTICOS | Mexico | |
| | SUV | Sundance Air | DANCEAIR | Venezuela | |
| SV | SVA | Saudia | SAUDIA | Saudi Arabia | |
| | SVD | St. Vincent Grenadines Air (1990) | GRENADINES | Saint Vincent and the Grenadines | |
| | SVF | Swedish Armed Forces | SWEDEFORCE | Sweden | |
| | AWJ | Sahel Airlines | SAHEL AIRLINES | Niger | |
| | SVH | Sterling Helicopters | SILVER | United Kingdom | |
| | SVI | Servicios De Transporte Aéreo | SETRA | Mexico | |
| | SVJ | Silver Air | | Djibouti | |
| | SVL | Sevastopol-Avia | SEVAVIA | Ukraine | |
| | SVN | Savanair (Angola) | SAVANAIR | Angola | |
| | SVO | Servicios Aeronáuticos de Oriente | SERVIORIENTE | Mexico | Defunct; Ceased operations in 2002 |
| | SVS | Servicios Aéreos Saar | AEREOS SAAR | Mexico | |
| | SVT | Seven Four Eight Air Services | SIERRA SERVICES | Luxembourg | |
| | SVX | Security Aviation | SECURITY AIR | United States | |
| WN | SWA | Southwest Airlines | SOUTHWEST | United States | |
| | SWB | Swissboogie Parapro | SWISSBOOGIE | Switzerland | |
| | SWC | South West Air | SAINT CLAIR | Canada | |
| A4 | SWD | Southern Winds Airlines | SOUTHERN WINDS | Argentina | Defunct; Ceased operations 5 December 2005 |
| | SWE | Swedeways | SWEDELINE | Sweden | |
| | | Spurling Aviation | AIR SEATTLE | United States | Code was ASL |
| WG | SWG | Sunwing Airlines | SUNWING | Canada | |
| | SWI | Sunworld Airlines | SUNWORLD | United States | |
| | SWJ | StatesWest Airlines | STATES | United States | |
| | SWO | Surinam International Victory Airline | SIVA | Suriname | defunct |
| | SWP | Star Work Sky | STAR WORK | Italy | |
| WQ | SWQ | Swift Air (Interstate Equipment Leasing) | SWIFTFLIGHT | United States | |
| LX | SWR | Swiss International Air Lines | SWISS | Switzerland | |
| SR | SWR | Swissair | SWISSAIR | Switzerland | Defunct; Ceased operations 31 March 2002 |
| SR | SDR | Sundair | SUNDAIR | Germany | |
| | SWS | Sunwest Aviation (Lindquist Investment) | SUNNY WEST | United States | Also operates under ICAO code CNK, callsign CHINOOK in Canada |
| | SWT | Swiftair | SWIFT | Spain | |
| LZ | SWU | Swiss Global Air Lines | EUROSWISS | Switzerland | Defunct; Reintegrated into Swiss International Air Lines on 19 April 2018 |
| WV | SWV | Swe Fly | FLYING SWEDE | Sweden | |
| S8 | SWW | Shovkoviy Shlyah | WAY AERO | Ukraine | |
| Q4 | SWX | Swazi Express Airways | SWAZI EXPRESS | Swaziland | |
| WO | WSW | Swoop | SWOOP | Canada | Defunct; Integrated into WestJet on 28 October 2023 |
| | SWY | Sky Jet | SWISSLINK | Switzerland | |
| | SWZ | Servair, Private Charter | SWISSBIRD | Switzerland | Code re-allocated |
| S8 | SWZ | Skywise Airline | SKYWISE | South Africa | Defunct; Ceased operations on 10 November 2015 |
| | SXA | Southern Cross Aviation | FERRY | United States | |
| | SXC | Sky Exec Aviation Services | SKY EXEC | Nigeria | |
| | SXE | Southeast Express Airlines | DOGWOOD EXPRESS | United States | |
| | SXM | Servicios Aéreos Especializados Mexicanos | SERVIMEX | Mexico | |
| XQ | SXS | SunExpress | SUNEXPRESS | Turkey | |
| | SXT | Servicios De Taxi Aéreo | SERTA | Mexico | |
| | SXX | Satellite Aero | SATELLITE EXPRESS | United States | |
| | SXY | Safari Express Cargo | SAFARI EXPRESS | Kenya | |
| | SYA | Skyways | LINEAS CARDINAL | Argentina | |
| | SYC | Systec 2000 | SYSTEC | United States | |
| | SYE | Sheba Aviation | | Yemen | |
| | SYF | Sky One Express Airlines | SKY FIRST | United States | |
| | SYG | Synergy Aviation | SYNERGY | United Kingdom | |
| | SYI | Sonalysts | | United States | |
| | SYJ | Slate Falls Airways | | Canada | |
| | SYK | Satsair | AEROCAB | United States | (J and A Properties) |
| | SYN | Syncrude Canada | SYNCRUDE | Canada | |
| RB | SYR | Syrian Arab Airlines | SYRIANAIR | Syrian Arab Republic | |
| | SYS | Shawbury Flying Training Unit | SHAWBURY | United Kingdom | |
| | SYV | Special Aviation Systems | SPECIAL SYSTEM | United States | |
| AL | SYX | Skywalk Airlines | SKYWAY-EX | United States | (Astral Aviation) |
| ZP | AZQ | Silk Way Airlines | SILK LINE | Azerbaijan | |
| 7L | AZG | Silk Way West Airlines | SILK WEST | Azerbaijan | |
| | SYY | South African Historic Flight | SKY COACH | South Africa | |
| | SZT | Servicios Aeronáuticos Z | AERO ZEE | Mexico | |
| | BHV | Specavia Air Company | AVIASPEC | Russia | |
| | BLY | Starair | BLARNEY | Ireland | |
| | BNC | Sundance Air | BARNACLE AIR | United States | |
| E5 | BRZ | Samara Airlines | BERYOZA | Russia | defunct |
| E5 | RBG | Air Arabia Egypt | ARABIA EGYPT | Egypt | |
| | CBN | Swedish Civil Aviation Administration | CALIBRATION | Sweden | |
| SC | CDG | Shandong Airlines | SHANDONG | China | |
| | CDS | Spectrem Air | SPECDAS | South Africa | |
| | CEE | Servicios Aéreos Centrales | CENTRA AEREOS | Mexico | |
| | CFL | Swedish Airlines | SWEDISH | Sweden | |
| | CGL | Seagle Air | SEAGLE | Slovakia | |
| | CIG | Sirius-Aero | SIRIUS AERO | Russia | |
| | CNK | Sunwest Home Aviation | CHINOOK | Canada | |
| SK | CNO | SAS Braathens | SCANOR | Norway | |
| 9C | CQH | Spring Airlines | AIR SPRING | China | |
| 3U | CSC | Sichuan Airlines | SI CHUAN | China | |
| FM | CSH | Shanghai Airlines | SHANGHAI AIR | China | Part of China Eastern Airlines |
| | CSY | Shuangyang General Aviation | SHUANGYANG | China | |
| ZH | CSZ | Shenzhen Airlines | SHENZHEN AIR | China | |
| 8C | CXI | Corendon Airlines Europe | TOURIST | Malta | |
| | DKT | Sioux Falls Aviation | DAKOTA | United States | |
| | DKY | Servicios Aéreos Elite | DAKOY | Spain | |
| | DNI | Servicios Aéreos Denim | AERO DENIM | Mexico | |
| | EAB | Swiss Eagle | SWISS EAGLE | Switzerland | |
| | EAN | Skypower Express Airways | NIGERIA EXPRESS | Nigeria | Express Airways Nigeria |
| | ENR | Scenic Air | | Namibia | |
| 7L | ERO | Sun D'Or | ECHO ROMEO | Israel | |
| NE | ESK | SkyEurope | RELAX | Slovakia | defunct |
| CQ | EXL | Sunshine Express Airlines | | Australia | |
| | EXY | South African Express | EXPRESSWAYS | South Africa | |
| | FFD | Stuttgarter Flugdienst | FIRST FLIGHT | Germany | |
| | FFH | Shalom Air Services | PEACE AIR | Nigeria | |
| | FJE | Silverjet | ENVOY | United Kingdom | |
| | FLH | Sky Bus | MILE HIGH | United States | |
| | GAD | South Coast Aviation | SOUTHCOAST | United Kingdom | |
| | GDE | Servicios Aéreos Gadel | GADEL | Mexico | |
| | GDG | S.P. Aviation | GOLDEN GATE | United States | |
| | GIK | Seba Airlines | SEBA | Guinea | |
| | GNA | Servicios Aéreos Gana | SERVIGANA | Mexico | |
| | GSW | Sky Wings Airlines | | Greece | |
| | GXL | Star XL German Airlines | STARDUST | Germany | |
| | HAU | Skyhaul | SKYHAUL | Japan | |
| | HIP | Starship | STARSA | Mexico | |
| | HJE | Servicios Ejecutivos Gosa | GOSA | Mexico | |
| SO | HKA | Superior Aviation | SPEND AIR | United States | |
| | HLO | Samaritan Air Service | HALO | Canada | |
| KI | SJB | SKS Airways | SOUTHER TIGER | Malaysia | Operates scheduled flights to outlying islands from Subang Airport to Redang and Tioman. |
| | HRI | Skyraidybos Mokymo Centras | HELIRIM | Lithuania | |
| | HSK | Sky Europe Airlines | MATRA | Slovakia | |
| | HSV | Svenska Direktflyg | HIGHSWEDE | Sweden | |
| | HSY | Sky Helicopteros | HELISKY | Spain | |
| TE | IGA | Skytaxi | IGUANA | Poland | |
| | IJS | Silvair | | United States | |
| | ILS | Servicios Aéreos Ilsa | SERVICIOS ILSA | Mexico | |
| | INK | Sincom-Avia | SINCOM AVIA | Ukraine | |
| | IRV | Safat Airlines | SAFAT AIR | Iran | |
| | IRZ | Saha Airlines Services | SAHA | Iran | |
| | JAM | Sunline Express | SUNTRACK | Kenya | |
| | JCM | Secure Air Charter | SECUREAIR | United States | |
| | JIM | Sark International Airways | SARK | United Kingdom | |
| JK | JKK | Spanair | SPANAIR | Spain | defunct |
| | KKS | Salem | KOKSHE | Kazakhstan | |
| | KOP | Servicios Aéreos Copters | COPTERS | Chile | |
| | KSP | Servicios Aéreos Expecializados En Transportes Petroleros | SAEP | Colombia | |
| | KYR | Sky Aeronautical Services | SKY AERONAUTICAL | Mexico | |
| | LGU | Servicios Aéreos Ejecutivos De La Laguna | LAGUNA | Mexico | |
| | LLA | Servico Leo Lopex | LEO LOPOZ | Mexico | |
| | LLS | Servicios Aéreos Estrella | SERVIESTRELLA | Mexico | |
| | LMG | South African Air Force | SOUTH AFRICAN | South Africa | |
| | LMO | Sky One Holdings as Privaira | SKY HOLDINGS | United States | Callsign and company name changed from Sky Limo Corporation "SKY LIMO" in 2015. |
| RZ* | LRS | Sansa | | Costa Rica | |
| | LSP | Spectrum Aviation Incorporated | AIR TONY | United Kingdom | |
| | MCG | SOS Helikoptern Gotland | MEDICOPTER | Sweden | |
| | MDT | Sundt Air | MIDNIGHT | Norway | |
| | MLO | Servicios Aéreos Milenio | MILENIO | Mexico | |
| | MMS | SAAD (A320) Limited | MUSAAD AIR | Cayman Islands | |
| | MRI | Servicios Aéreos Moritani | MORITANI | Mexico | |
| 2G* | MRR | San Juan Airlines | MARINER | United States | |
| | MSG | Servico Aéreo Regional | SAR-REGIONAL | Mozambique | |
| | MSP | Servicio De Vigilancia Aérea Del Ministerio De Seguridad Pública | SEGURIDAD | Costa Rica | |
| | MTG | Servicios Aéreos MTT | | Mexico | |
| 1Z | APD | Sabre Pacific | | Australia | |
| 1S | | Sabre | | United States | |
| 1I | | Sierra Nevada Airlines | | United States | |
| 1H | | Siren-Travel | | Russia | |
| 1Q | | Sirena | | Russia | |
| | SBW | Snowbird Airlines | SNOWMAN | Finland | |
| 1K | | Southern Cross Distribution | | Australia | |
| 1K | | Sutra | | United States | |
| 2C | | SNCF | | France | |
| 2S | | Star Equatorial Airlines | | Guinea | |
| | NAD | Seulawah Nad Air | SEULAWAH | Indonesia | |
| | NAZ | Servicios Aéreos del Nazas S.A. de C.V. | NAZAS | Mexico | |
| | NCS | Simpson Air Ltd | COMMUTER-CANADA | Canada | |
| NK | NKS | Spirit Airlines | SPIRIT WINGS | United States | |
| | NON | Servicios Aéreos Latinoamericanos | SERVICIOS LATINO | Mexico | |
| | NRZ | Servicios Aéreos Monarrez | MONARREZ | Mexico | |
| | NSC | Societe De Transport Aerien De Mauritanie | TRANS-SOCIETE | Mauritania | |
| | NSE | SATENA | SATENA | Colombia | |
| | NTB | Servicios Aéreos Del Norte | SERVINORTE | Mexico | |
| | NTG | Servicios Integrales De Aviación | INTEGRALES | Mexico | |
| S0 | OKS | Slok Air Gambia | SLOK GAMBIA | Gambia | |
| | OKT | Soko Aviation | SOKO AIR | Spain | |
| | OLC | Solar Cargo | SOLARCARGO | Venezuela | |
| | OLO | Soloflight Aviation | SOLO | United Kingdom | Defunct; Dissolved 20 July 2010 |
| | ONG | Sonnig SA | SONNIG | Switzerland | |
| SO | OSL | Sosoliso Airlines | SOSOLISO | Nigeria | Defunct; Ceased operations in 2006 |
| | OSS | Servicios Aéreos Noticiosos | NOTICIOSOS | Mexico | |
| | OTL | South Airlines | SOUTHLINE | Ukraine | |
| VA | VOZ | Virgin Australia Regional Airlines | VELOCITY | Australia | Operated under Virgin Australia |
| | PIV | Sokol | AEROSOKOL | Russia | |
| | PLT | South Carolina Aeronautics Commission | PALMETTO | United States | |
| | PMR | Servicios Aéreos Premier | SERVICIOS PREMIER | Mexico | |
| | PNS | Survey Udara (Penas) | PENAS | Indonesia | |
| | POB | Servicios Aéreos Poblanos | POBLANOS | Mexico | |
| 5S | PSV | Servicios Aéreos Profesionales | PROSERVICIOS | Dominican Republic | |
| | PTM | Southeastern Airways | POSTMAN | United States | |
| | PUR | Spurwing Airlines | SPURWING | South Africa | |
| 1I | PZR | Sky Trek International Airlines | PHAZER | United States | |
| | RBW | Shandong Airlines Rainbow Jet | CAI HONG | China | |
| | REJ | SA Airlink Regional | REGIONAL LINK | South Africa | |
| | RER | Servicio Aéreo Regional Regair | REGAIR | Ecuador | |
| | RFT | Scoala Superioara De Aviatie Civila | ROMANIAN ACADEMY | Romania | |
| | RGC | Servicios Aéreos Regiomontanos | REGIOMONTANO | Mexico | |
| | RLS | S-Air | S-AIRLINES | Russia | |
| | RMP | Servicios De Rampa Y Mostrador | SERAMSA | Mexico | |
| | RSE | SNAS Aviation | RED SEA | Saudi Arabia | |
| SX | SKB | Skybus Airlines | SKYBUS | United States | defunct |
| | SKC | Skymaster Airlines | SKYMASTER AIR | Brazil | |
| | SKD | Sky Harbor Air Service | SKY DAWG | United States | |
| | SKE | Sky Tours | SKYISLE | United States | |
| | AZG | Sakaviaservice | SAKSERVICE | Georgia | Defunct |
| | SKF | Skycraft | SKYCRAFT | United States | |
| | SKG | Skycraft Air Transport | SKYCRAFT-CANADA | Canada | |
| RU | SKI | SkyKing Turks and Caicos Airways | SKYKING | Turks and Caicos Islands | IATA was QW |
| | SKK | Skylink Aviation | SKYLINK | Canada | |
| | SKL | Skycharter (Malton) | SKYCHARTER | Canada | |
| | SKN | Skyline Aviation Services | SKYLINER | United States | |
| | SKO | Scottish Airways Flyers | SKYWORK | United Kingdom | |
| | SKR | Skyscapes Air Charters | SKYSCAPES | South Africa | |
| | SKS | Sky Service | SKY SERVICE | Belgium | Callsign re-allocated |
| | SKS | Sky Link Aviation | | Pakistan | |
| S3 | BBR | Santa Barbara Airlines | SANTA BARBARA | Venezuela | |
| XT | SKT | SkyStar Airways | SKY YOU | Thailand | |
| H2 | SKU | Sky Airline | AEROSKY | Chile | |
| OO | SKW | SkyWest Airlines | SKYWEST | United States | |
| JZ | SKX | Skyways Express | SKY EXPRESS | Sweden | Ceased operations 2012; Operations continue as Avia Express |
| BC | SKY | Skymark Airlines | SKYMARK | Japan | |
| | SKZ | Skyway Enterprises | SKYWAY-INC | United States | |
| LJ | SLA | Sierra National Airlines | SELAIR | Sierra Leone | |
| | SLB | Slok Air | SLOK AIR | Nigeria | |
| | SLD | Silver Air | SILVERLINE | Czech Republic | |
| | SLE | Streamline | SLIPSTREAM | South Africa | |
| | SLF | Starfly | ELISTARFLY | Italy | |
| | SLG | Saskatchewan Government | LIFEGUARD | Canada | Air Ambulance Service |
| | SLH | Silverhawk Aviation | SILVERHAWK | United States | |
| | AGE | Servicios Aéreos de Los Ángeles | AEROANGEL | Mexico | |
| MI | SLK | SilkAir | SILKAIR | Singapore | Merged with Singapore Airlines |
| 6Q | SLL | Slovak Airlines | SLOV LINE | Slovakia | Defunct; Ceased operations in February 2007 |
| PY | SLM | Surinam Airways | SURINAM | Suriname | |
| | SLN | Sloane Aviation | SLOANE | United Kingdom | |
| | SLP | Salpa Aviation | SALPA | Sudan | |
| | SLS | Servicios Aéreos Slainte | SERVICIOS SLAINTE | Mexico | |
| | SLV | Stella Aviation | AVISTELLA | Mauritania | |
| | SLW | Salama Airlines Nigeria | SALMA AIR | Nigeria | |
| | SLX | Sete Linhas Aéreas | SETE | Brazil | |
| | SLY | Sky Line for Air Services | SKYCO | Sudan | |
| | SLZ | Super Luza | LUZA | Angola | |
| | SMA | SMA Airlines | SESAME | Nigeria | |
| | SMC | Sabang Merauke Raya Air Charter | SAMER | Indonesia | Defunct; Ceased operations in 2011 |
| | SMD | Servicios Aéreos La Marquesa | SERVICIOS MARQUESA | Mexico | |
| 8D | | Servant Air | | United States | |
| | SME | Semos | SEMICH | Kazakhstan | |
| | SMF | Smalandsflyg | GORDON | Sweden | |
| | SMH | Smithair | SMITHAIR | United States | |
| E8 | SMK | Semeyavia | ERTIS | Kazakhstan | Defunct; Ceased operations in July 2013 |
| | SML | Smith Air (1976) | SMITH AIR | Canada | |
| | SMM | Summit Air | SUMMIT | Canada | |
| | SMQ | Samar Air | SAMAR AIR | Tajikistan | |
| | SMR | Somon Air | SOMON AIR | Tajikistan | |
| | SMT | Skyline | SKYLIMIT | Nigeria | |
| | AOS | Servicios Aéreos Del Sol, S.A. de C.V. | AEROSOL | Mexico | |
| | SNA | Senator Aviation Charter | SENATOR | Germany | |
| NB | SNB | Sterling Airlines | STERLING | Denmark | Defunct; Ceased operations on 29 October 2008 |
| | SNE | Servicios Aéreos De Nicaragua (SANSA) | SANSA | Nicaragua | |
| | SNF | Shans Air | SHANS AIR | Russia | |
| | SNH | Senair Services | SENSERVICE | Senegal | |
| | SNI | Savanah Airlines | SAVANAHLINE | Nigeria | Defunct; Prohibited from operating in 2007 |
| 6J | SNJ | Solaseed Air | NEWSKY | Japan | |
| SL | SNK | Southeast Airlines (Sun Jet International) | SUN KING | United States | Defunct; Ceased operations on 30 November 2004 |
| | SNL | Soonair Lines | SOONAIR | United States | |
| | SNM | Servizi Aerei | SERVIZI AEREI | Italy | |
| | SNP | Sun Pacific International | SUN PACIFIC | United States | |
| | SNQ | Sun Quest Executive Air Charter | EXECU-QUEST | United States | |
| | SNS | Societe Centrafricaine De Transport Aerien | | Central African Republic | |
| | SNT | Suncoast Aviation | SUNCOAST | United States | |
| | SNU | Snunit Aviation | | Israel | |
| | SNV | Sudanese States Aviation | SUDANESE | Sudan | |
| | SNW | Sun West Airlines | SUN WEST | United States | |
| | SNX | Sun Air Aviation Services | SUNEX | Canada | |
| | SOB | Stabo Freight | STABO | Zambia | |
| | SOC | Southern Cargo Air Lines | | Russia | |
| | SOH | Southern Ohio Aviation Sales | SOUTHERN OHIO | United States | |
| | SOI | Southern Aviation | SOAVAIR | Zambia | |
| IE | SOL | Solomon Airlines | SOLOMON | Solomon Islands | |
| | SOM | Somali Airlines | SOMALAIR | Somali Republic | |
| | SON | Sunshine Air Tours | SUNSHINE TOURS | United States | |
| | SOO | Southern Air | SOUTHERN AIR | United States | Defunct; Purchased by Atlas Air in 2016 and fully integrated on 17 November 2021 |
| ZS | SOP | Solinair | SOLINAIR | Slovenia | |
| | SOR | Sonair Servico Aéreo | SONAIR | Angola | |
| | SOT | Southeast Correct Craft | SOUTH COURIER | United States | |
| 9X | SOU | Southern Airways | SOUTHERN EXPRESS | United States | |
| 6W | SOV | Saratov Airlines Joint Stock Company | SARATOV AIR | Russia | |
| | SOW | Sowind Air | SOWIND | Canada | Defunct - code reallocated |
| | SOW | White Sparrow GmbH | SPARROW | Austria | |
| | SOX | Solid Air | SOLIDAIR | Netherlands | |
| HZ | SOZ | Sat Airlines | SATCO | Kazakhstan | |
| | SPA | Sierra Pacific Airlines | SIERRA PACIFIC | United States | |
| | SPB | Springbok Classic Air | SPRING CLASSIC | South Africa | |
| | SPC | Spark Air Cargo | Spark Cargo | United States | |
| | SPE | Sprague Electric Company | SPRAGUE | United States | |
| | SPF | Space World Airline | SPACE WORLD | Nigeria | |
| | SPG | Springdale Air Service | SPRING AIR | United States | |
| | SPH | Sapphire Executive Air | SAPPHIRE-CHARTER | South Africa | |
| HK | SPI | South Pacific Island Airways | SOUTH PACIFIC | United States | Defunct; Ceased operations in 1987 |
| | SPK | Spark Airlines | SPARK | United States | |
| | SPL | Servicios Corporativos Aéreos De La Laguna | CORPORATIVOS LAGUNA | Mexico | |
| | SPN | Skorpion Air | AIR SKORPIO | Bulgaria | |
| | SPP | Sapphire Aviation | SAPPHIRE | United States | |
| | SPQ | Servicios Aéreos Palenque | SERVICOS PALENQUE | Mexico | |
| | TBS | Servicios Aéreos Tribasa | TRIBASA | Mexico | |
| S5 | TCF | Shuttle America | MERCURY | United States | Defunct; Merged into Republic Airways on 31 January 2017 |
| | SVV | SALTAVIATION | SALT | Poland | |
| | TGT | SAAB Nyge Aero | TARGET | Sweden | |
| | THB | Spark Air | THAI SABAI | Thailand | |
| | TIH | S C Ion Tiriac | TIRIAC AIR | Romania | |
| | TRL | Starlite Aviation | STARSTREAM | South Africa | |
| | TRN | Servicios Aéreos Corporativos | AEROTRON | Mauritania | |
| | TTM | Societe Tout Transport Mauritanien | TOUT-AIR | Mauritania | |
| | TZU | Servicios Aéreos Tamazula | TAMAZULA | Mexico | |
| | UGP | Shar Ink | SHARINK | Russia | Defunct; Ceased operations in 2019 |
| | UKU | Second Sverdlovsk Air Enterprise | PYSHMA | Russia | |
| | UNT | Servicios Aéreos Universitarios | UNIVERSITARIO | Mexico | |
| | USK | Skif-Air | SKIF-AIR | Ukraine | |
| | USN | Smarkand Aero Servise | SAMAS | Uzbekistan | |
| C7 | UZS | Samarkand Airways | SOGDIANA | Uzbekistan | |
| | VDO | Servicios Aéreos Avandaro | AVANDARO | Mexico | |
| | VGS | Stichting Vliegschool 16Hoven | SMART | Netherlands | |
| | VRB | Silverback Cargo Freighters | SILVERBACK | Rwanda | |
| | VRS | Sirvair | VAIRSA | Mexico | |
| DV | VSV | SCAT Airlines | VLASTA | Kazakhstan | |
| | VXN | Sunset Aviation | VIXEN | United States | |
| | TWY | Sunset Aviation, LLC | TWILIGHT | United States | dba Solairus Aviation |
| | WCC | Sport Air Travel | WEST COAST | United States | |
| | WFC | Swift Copters | SWIFTCOPTERS | Switzerland | |
| | WLK | Skyrover CC | SKYWATCH | South Africa | |
| F2 | XLK | Safarilink Aviation | SAFARILINK | Kenya | |
| | XMX | SENEAM | SENEAM | Mexico | |
| | XPG | Southport Air Service | | United States | |
| | XSA | Spectrum Air Service | | United States | |
| | XSN | Stephenville Aviation Services | | Canada | |
| | XTA | Servicios Aéreos Textra | TEXTRA | Mexico | |
| | XTR | Sector Airlines | EXTER | Canada | |
| | XXS | Skyplan Services | | Canada | |
| | YBE | Stewart Aviation Services | YELLOW BIRD | United States | |
| R1 | | Sirin | | | |
| | SXN | SaxonAir | SAXONAIR | United Kingdom | |
| O3 | CSS | SF Airlines | SHUN FENG | China | |
| | SAF | Singapore Air Force | SINGA | Singapore | |
| | KFE | SkyFirst LTD | SKYFIRST | Malta | 2012 |
| PQ | SQP | SkyUp | SKYUP | Ukraine | |
| U5 | | SkyUp MT | | Malta | |
| S5 | LLC | Small Planet Airlines | SMALL PLANET | Lithuania | defunct |
| P7 | LLP | Small Planet Airlines | SKYPOL | Poland | defunct |
| P2 | LLI | Small Planet Airlines | AURIGA | Italy | defunct |
| 5P | LLX | Small Planet Airlines | GERMANJET | Germany | defunct |
| UL | ALK | SriLankan Airlines | SRILANKAN | Sri Lanka | |
| DJ | SRR | Star Air | WHITESTAR | Denmark | |
| V9 | HCW | Star1 Airlines | STAR1 | Lithuania | defunct |
| Q4 | TLK | Starlink Aviation | STARLINK | Canada | |
| | UFA | State Flight Academy of Ukraine | FLIGHT ACADEMY | Ukraine | |
| | CDL | Sunbird Airlines | CAROLINA | United States | |
| XG | SXD | Sunexpress Deutschland | SUNRISE | Germany |
| SO | AAS | Sunshine Airlines | | | defunct |
| | RZ | Superna Airlines | YANGTZE RIVER | China | |