Airlines — S
- SUDSudan Airways
- SDZSudan Pezetel for Aviation
- SNVSudanese States Aviation
- SDBSukhoi Design Bureau Company
- SMMSummit Airlines
- SURSun Air
- SUFSun Air (Fiji)
- SNXSun Air Aviation Services
- SUSSun Air of Scandinavia
- SCXSun Country Airlines
- EROSun D'Or
- SFGSun Freight Logistics
- SUHSun Light
- SNPSun Pacific International
- SNQSun Quest Executive Air Charter
- SJESunair 2001
- CDLSunbird Airlines
- SNTSuncoast Aviation
- SUVSundance Air
- SDFSundorph Aeronautical Corporation
- MDTSundt Air
- SXSSunExpress
- JAMSunline Express
- SDCSunrise Airlines
- KSZSunrise Airways
- VXNSunset Aviation
- SONSunshine Air Tours
- EXLSunshine Express Airlines
- SSQSunstate Airlines
- SUGSunu Air
- SSTSunwest Airlines
- SWSSunwest Aviation (Lindquist Investment)
- CNKSunwest Home Aviation
- SWGSunwing Airlines
- SWISunworld Airlines
- SLZSuper Luza
- HKASuperior Aviation
- SUKSuperior Aviation Services
- SZZSUR Lineas Aereas
- SLMSurinam Airways
- SWOSurninam International Victory Airline
- PNSSurvey Udara (Penas)
- HSVSvenska Direktflyg
- SVGSVG Air
- SJMSvyaz Rossiya
- SWXSwazi Express Airways
- SZLSwaziland Airlink
- SWVSwe Fly
- SWESwedeways
- CFLSwedish Airlines
- SVFSwedish Armed Forces
- CBNSwedish Civil Aviation Administration
- BBBSwedJet Airways
- SRLSwedline Express
- SWQSwift Air (Interstate Equipment Leasing)
- WFCSwift Copters
- SWTSwiftair
- SUISwiss Air Force
- SAZSwiss Air-Ambulance
- EABSwiss Eagle
- SWUSwiss European Air Lines
- SWRSwiss International Air Lines
- SJTSwiss Jet
- SWRSwissair
- SWBSwissboogie Parapro
- SCLSwitfair Cargo
- SYNSyncrude Canada
- SYGSynergy Aviation
- SYRSyrian Arab Airlines
- PSBSyrian Pearl Airlines
- SYCSystec 2000