Airlines — S
- SEEShaheen Air Cargo
- SAIShaheen Air International
- SHNShaheen Airport Services
- FFHShalom Air Services
- SAWSham Wing Airlines
- CDGShandong Airlines
- RBWShandong Airlines Rainbow Jet
- CSHShanghai Airlines
- SHQShanghai Airlines Cargo
- SNFShans Air
- CXIShanxi Airlines
- UGPShar Ink
- SHJSharjah Ruler's Flight
- SHASharp Airlines
- SHVShavano Air
- SYSShawbury Flying Training Unit
- SHWShawnee Airline
- SYESheba Aviation
- SHEShell Aircraft
- SHMSheltam Aviation
- CSZShenzhen Airlines
- EPAShenzhen Donghai Airlines
- SHOSheremetyevo-Cargo
- SHRShooter Air Courier
- SHGShoprite Group
- SHKShorouk Air
- SWWShovkoviy Shlyah
- CSYShuangyang General Aviation
- SHSShura Air Transport Services
- SFCShuswap Flight Centre
- TCFShuttle America
- SCRSi-Chang Flying Service
- SGNSiam GA
- SIBSibaviatrans
- CSCSichuan Airlines
- SRHSiem Reap Airways
- SIESierra Express
- SRXSierra Expressway Airlines
- SLASierra National Airlines
- SPASierra Pacific Airlines
- SUASilesia Air
- AZQSilk Way Airlines
- SLKSilkAir
- IJSSilvair
- SLDSilver Air
- VRBSilverback Cargo Freighters
- SLHSilverhawk Aviation
- FJESilverjet
- NCSSimpson Air Ltd
- RMKSimrik Airlines
- INKSincom-Avia
- SIASingapore Airlines
- SQCSingapore Airlines Cargo
- DKTSioux Falls Aviation
- SRNSirair
- SIOSirio
- SIWSirio Executive
- CIGSirius-Aero
- VRSSirvair
- SUTSistemas Aeronauuticos 2000
- SITSITA
- SGYSkagway Air Service
- USKSkif-Air
- SPNSkorpion Air
- KYRSky Aeronautical Services
- SGMSky Aircraft Service
- SKUSky Airline
- SHYSky Airlines
- SWMSky Angkor Airlines (ZA)
- SSYSky Aviation
- SBMSky Bahamas
- FLHSky Bus
- SCKSky Cam
- HSKSky Europe Airlines
- SXCSky Exec Aviation Services
- SXPSky Express
- SEQSky Eyes
- SGDSky Gate International Aviation
- SHCSky Harbor Air Service
- HSYSky Helicopteros
- LMOSky Limo Corporation
- SLYSky Line for Air Services
- SYFSky One Express Airlines
- SKVSky Regional
- SKVSky Regional Airlines
- SKSSky Service
- SKESky Tours
- PZRSky Trek International Airlines
- SABSky Way Air
- CR7Sky Wing Pacific
- GSWSky Wings Airlines
- KYBSkybridge Airops
- SKBSkybus Airlines
- SKLSkycharter (Malton)
- SKFSkycraft
- SKGSkycraft Air Transport
- SDLSkydrift
- ESKSkyEurope
- SFTSkyfreight
- SGTSkygate