Status key: Y-tested OK; N-tested bad; R-recently added, untested; U-under construction
* Controlled duplication, meaning that duplicate codes exist.

CARRIER	ST	IATA Code	DOT Code	DOT 5-digit	LINK	OK
Samoa Airlines Inc (Samoa Aviation Inc) dba> Samoa Air (located in Pago Pago, American Samoa)	AS	SE	MB TS SE SMO	06913	?	?
San Juan Airlines	WA	YS	YS SJA	?	www	Y
Scenic Airlines (Eagle Canyon Airlines > Eagle Jet Charter Inc)	NV	YR	YR FE EGC HSZ	?	www	Y
Seair Alaska Airlines	?	?	KJ SAI	?	?	?
Servant Air Inc	AK	8D*	78 SVA	06973	?	?
Sierra Pacific Airlines	AZ	SI*	SI TSA	06798	?	?
Skagway Air Service Inc	AK	7J*	5U 7J SKG	06972	www1 www2 www3 www4	R R R R
Sky Trek International Airlines	NJ	1I*	1I	06802	www	Y
Sky West Airlines (SkyWest Airlines) (subsidiary of SkyWest Inc) dba> Delta Connection; Continental Connection; and United Express	UT	OO	QG OO SEA	?	www email	Y R
Skybus	?	?	FW	?	?	?
Smokey Bay Air Inc	AK	2E*	SKB	06971	?	?
South Pacific Island Airways	?	?	HK SOP	?	?	?
Southeast Airways (Southeast Air) (Southeast Air Freight) (Mario's Air Inc) (scheduled cargo)	FL	M2*	JX	?	www	R
SouthCentral Air Inc	?	XE	XE AND	?	www	Y
Southern Air Transport > Southern Air Inc (changed to Group I Regionals 01/01/2002 with a new code 9S)	OH	SJ 9S*	SJ 9S SAQ	09786	www	Y
Southern Express Airways	?	?	ZE SEP	?	?	?
Spernak Airways Inc	AK	?	SNK	06970	?	?
Spirit of America	?	?	IM	?	www	R
Sun Jet (Sunjet International)	?	JX	JX	06850	www	Y
Sun Pacific International (Sun Pacific Airlines (VL?))	?	--	VL? SPQ	06797	?	?
Sun West Airlines	?	?	KY	?	?	?
Sunaire (Aviation Assoc.)	?	OY	OY SNA	?	?	?
Sunworld International (Sun World International)	KY OH	SM	X5 SM	06853	www	Y

Special reporting rules apply to this group.? None of these carriers is required to file Form 41 Financial data with the USDOT.? Therefore, no 5-digit code is assigned.?

Status key: Y-tested OK; N-tested bad; R-recently added, untested; U-under construction
* Controlled duplication, meaning that duplicate codes exist.

CARRIER	ST	IATA Code	DOT Code	DOT 3-Letter Code	LINK	OK
Saber Aviation	?	?	?	SBA	?	?
Saber Cargo Airlines Inc	NC	?	?	?	www	R
Sacramento Executive Helicopters Inc	CA	?	?	?	www email	R R
Safe Air International (Safe Air Inc) dba> Inland Express	FL	2S	2S IPS	?	www1 www2 email	R N R
Sailboats Inc	?	?	?	?	www	Y
St Croix Aviation Inc (charter)	VI	?	?	?	dir	R
St Louis Helicopter Airways Inc	MO	?	?	?	?	?
St Thomas Tax-Air	?	?	?	QHZ	?	?
Sajen Air	?	?	?	SAJ	?	?
Salaika Aviation (heli)	TX	?	?	?	www email	R R
Salair Inc > Air Alaska Cargo Inc	?	8S	?	SLR	?	?
Sallee's Aviation	?	?	PN	SAL	?	?
Salmon Air dba> Mountain Bird Inc	ID	S6	?	?	www email	Y R
Samoan Airlines	?	?	?	SAM	?	?
San Antonio Helicopter Service	?	?	?	?	www	Y
San Joaquin Helicopters dba> Horizon Helicopters	CA	?	?	?	www1 email www2 email	R R R R
San Juan Air	PR	?	?	SJN	?	?
Sandpiper Air Charter Service	SC	?	?	?	?	?
Santa Barbara Airlines CA (Venezuela) > Santa Barbara Airlines Cargo(main corporate offices in Miami, FL)	FL	S3	?	?	www	Y
The Sante Fe Airline Company	?	?	?	SFA	?	?
Satellite	?	?	?	SAT	?	?
Scenic Air Inc (Scenic Air Lines?)	UT?	3L	?	SCZ	?	?
Schaefer Air Service Inc (division of Schafer Ambulance Co.)	?	?	?	?	?	?
Scott Aviation	?	?	?	SCN	?	?
Sea Air Shuttle	?	?	?	SAH	?	?
Sea Hawk Air	AK	?	?	?	www	R
Seaboard World Airlines (historical?)	?	?	SB	?	unoff	R
Seaborne Aviation Inc > Seaborne Airlines	AK VI	BB*	BB	SEB	www	R
Seaco Airlines	?	?	?	SCO	?	?
SeaCoast Airlines	?	?	?	?	www	Y
Seagull Air Service	?	5N	5N	SEG	?	?
Seaplane Shuttle Transport	?	?	?	SST	?	?
Seaplanes of Key West	?	?	?	?	www	Y
Seattle Flight Service	?	?	?	SGZ	?	?
Seattle Helicopter	?	?	?	SFZ	?	?
Security Air Carrier	?	?	?	SEC	?	?
Sedalia Marshall Boonville Stage Line	?	?	?	STG	?	?
Semo Aviation	?	?	?	SEM	?	?
Seneca Flight Operations (division of Seneca Foods Corp.)	?	?	?	?	email	R
Sentinel Airlines	?	?	?	SXZ	?	?
Servair West Inc	?	?	?	?	email	R
Service Aviation	?	?	?	SER	?	?
Service By Air	?	?	?	?	www email	R R
SFO Helicopter Airlines	?	?	FN	SFO	?	?
Shamrock Airlines (Pan Maryland Airways)	?	?	?	PMD	?	?
Shasta Air	?	?	?	SHS	?	?
Shavano Air	?	?	?	SHV	?	?
Shawnee Air	?	?	?	SAZ	?	?
Shawnee Airlines	FL	?	?	SNE	?	?
Shawnee Airways	OH	?	?	KKZ	?	?
Shenandoah Airline	?	?	?	SYZ	?	?
Shier Aviation Corporate Helicopters (subsidiary of Shier Aviation Group) dba> Corporate Helicopters	CA	?	?	?	?	?
Shoreline Aviation Inc (charter)	CT	?	?	?	www email	Y R
Shorter Airways	?	?	?	OUZ	?	?
Shuttle America Corp (Air Shuttle)	CT	S5	S5	SHA	www1 www2	R R
Sierra Express	?	?	?	SSS	?	?
Sierra Expressway	?	?	?	SXP	?	?
Sierra Flight Service	?	?	?	SFS	?	?
Sierra Nevada Airways Inc	NV	1I* ZS?	?	SNV	?	?
Silver Bay Logging Inc Aviation Div. (heli)	?	?	?	?	?	?
Silver Kris Service	?	?	?	SKS	?	?
Silver Ranch Airpark Inc	?	?	?	?	?	?
Silver State Airlines	?	?	?	SIA	?	?
Silver Wings Aviation	?	?	?	SIL	?	?
Simmons Aviation	?	?	?	SIM	?	?
Sisk Aviation Activities	?	?	?	SSK	?	?
Sizer Airways	?	?	?	ZSZ	?	?
Sky Aviation (division of Hawkins & Powers Aviation Inc)	?	?	?	?	email	R
Sky Courier (subsidiary of Airborne Express)	?	?	?	?	www	R
Sky Harbor Air Service	?	?	?	?	?	?
Sky Helicopters Inc	TX	?	?	?	www email email	R R R
Sky Limo Air Charter	FL	?	?	?	www	Y
Sky One Express	?	?	?	SOE	?	?
Sky Quest	?	?	?	SKQ	?	?
Sky Trekking Alaska (Fiskehauk Airways)	AK	?	?	?	www1 www2 email	R R R
Sky-Jet	?	?	?	SKJ	?	?
Skybird Aviation Inc	CA	?	?	?	www email email	Y R R
Skybus Express Airlines	?	?	XF	SYB	?	?
Skycraft (Fort Vancouver Airlines)	?	?	?	FVA	?	?
Skyfreight Inc	WA	SFT	?	SKY	?	?
Skyhawk Helicopter Services Inc	UT	?	?	?	?	?
Skyline Airlines	?	?	?	SCT	?	?
SkyMark	WA	?	?	?	?	?
Skymaster	?	?	?	SYM	?	?
Skystar International	?	?	7S	?	?	?
Skystream Airlines (Hub Airlines)	?	?	?	HUB	?	?
SkyTeam? Airlines	?	UQ*	?	?	?	?
Skytrain (Air Great Lakes)	?	?	?	SKT	?	?
Skyway Airlines/ The Midwest Express Connection (see also Astral Aviation)	?	AL	AL 11	?	www	R
Skyway Aviation	?	?	?	ZYZ	?	?
Skyway Aviation of Texas (Air Americana)	?	?	?	SAX	?	?
Skyway Enterprises Inc	FL	?	?	?	www email	R R
Skyworld Airlines	?	?	73	?	?	?
Slocum Air	?	?	?	SLO	?	?
Smithair Inc	GA	?	?	?	email	R
Smyer Aircraft Company	?	?	?	SMY	?	?
Soonair Lines	?	?	?	SOL	?	?
Sound Flight Inc (Soundflight)	?	?	?	?	www email	R R
South Aero Inc	NM	?	?	?	?	?
South Central Air	?	?	?	SOC	?	?
South Coast Airways (Jerry's Aviation)	?	?	?	SCY	?	?
South East Alaska Airlines (Webber)	?	?	?	WEB	?	?
South Sea Helicopter Corporation (South Sea Helicopters Inc) dba> South Sea Tours	HI	?	?	?	email	a
South Seas Airways	?	?	?	SZZ	?	?
Southeast Airlines	?	?	?	SLZ	?	?
Southeast Airlines	TN	?	?	AVC	?	?
Southeast Airmotive Corp.	?	?	?	?	?	?
Southeast Commuter Airlines	?	?	?	SCA	?	?
Southeast Mississippi Air Ambulance District (heli) dba> Rescue-7	MS	?	?	?	?	?
Southeastern Air Transport	?	?	?	SOT	?	?
Southeastern Commuter Airlines (Coastal)	?	?	?	COT	?	?
Southerland (charter)	VI	?	?	?	dir	R
Southern Airlines Inc (Scheerer Florida Commuter)	?	?	?	FCA	?	?
Southern Airways (Flight Line?) > Republic > Northwest Airlines	?	?	EC	FTI	?	?
Southern Aviation	?	?	?	SMZ	?	?
Southern Jersey Airways	NJ	6J	6J	AVZ	?	?
Southern Maryland Aviation	?	?	?	SMA	?	?
Southern Seaplane (Southern Skies Commuter)	?	?	?	SSP	?	?
Southwest Aviation Inc dba> Midwest Aviation	?	?	?	?	email	R
Specialized Transport International Inc	?	?	?	?	www	R
Spirit Helicopter	?	?	?	SPH	?	?
Sportsman Air Charter Service	?	?	?	SPA	?	?
Sportsman Flying Service	?	?	?	SPR	?	?
Sportsman International Airways	?	?	?	SPI	?	?
Springdale Air Freight Inc	?	?	?	?	?	?
Springdale Air Service	?	?	?	SPF	?	?
Springdale Air Service Inc (Springdale Air)	AR	?	72	SPG	?	?
S.S. Airways	?	?	?	SSA	?	?
Stahmannfarms	?	?	?	SFI	?	?
Star Aviation	?	?	?	SRA	?	?
Star Aviation Corporation	?	?	?	STR	?	?
Star Aviation Inc	?	?	?	?	?	?
Starflite Inc	AK	?	?	?	?	?
State Airlines	?	?	?	STA	?	?
Statewest Airlines	?	YW	YW	?	?	?
Stateswest Airlines	?	?	?	STW	?	?
Sterling Air Service	?	?	?	SRL	?	?
Sterling Airways Inc	?	?	?	?	?	?
STI Aviation Inc	FL	?	?	?	www	R
Stopher Mechanical Company (Southwest)	?	?	?	SMC	?	?
Suburban Air Freight Inc	NE	?	?	?	www	R
Suburban Airlines	?	?	?	SBN	?	?
Sugarpine Aviators	?	?	?	?	email	R
Sum Air Services Inc	FL	RN*	?	?	?	?
Summit Airlines (Delaware Air Freight)	?	?	?	DUZ	?	?
Summit Aviation Corp. (heli)	?	?	?	?	email	R
Sun Aire Lines (Borrego Springs Airline)	?	?	?	OOZ	?	?
Sun Airlines	?	?	?	SUN	?	?
Sun Basin Airline	?	?	?	SUB	?	?
Sun International Airways	?	?	?	SUI	?	?
Sun Valley Airlines	?	?	?	SVL	?	?
Sunaire Express	VI	?	?	?	dir	R
Sunbelt Airlines	?	?	?	SUT	?	?
Sunbelt Airlines (Jamaire Inc)	?	?	?	JAM	?	?
Sunbird Aviation Inc	?	?	?	?	www email	R R
Sunbird Inc > Apple Vacations	KY	B6	FS	SKI	www1 www2	Y Y
Suncoast Airlines	?	?	WS	?	?	?
Suncoast Flying Services	?	?	?	?	email	R
Suncoast Helicopters Inc (division of Huizenga Holding Co.)	?	?	?	?	?	?
Sundance Airlines	?	?	?	SUD	?	?
Sundance Helicopter Inc	?	?	?	?	www email	R R
Sundorph Aeronautical	?	?	?	SAC	?	?
Sunrise Airlines dba> Jun Air Express	NV	OQ*	OQ	XPA	www	R
Sunrise Airlines Inc	?	?	YR	ASW	?	?
Sunrise Aviation Inc	AK	?	?	?	www	N
Sunshine Air Charter	FL	?	?	?	www	Y
Sunshine Airlines Inc	CA	-- SO	?	SUA	www email	Y R
Sunwest Airlines	AZ	?	?	SWA	?	?
Superior Aviation Inc	MI	AB* SO	?	?	www	R
Surface Transportation (not an airline, but a code to designate a surface means of transportation for one leg of an air journey to an off-line point)	?	?	--	?	?	?
SurfAir Inc	?	?	?	?	www email	R R
Swift Aire Lines (1969-1981)	CA	?	?	SWT	?	?