Models · Interstate · Piston singles · data as of October 26, 2026

Interstate S-1

104 on the U.S. register across 6 versions the FAA records separately. Built from 1941 to 1993; half of them date from 1941 or earlier. California has the most (11). 13% are registered to companies, flight schools, clubs and other organisations; the rest to individuals, who are not named here at this time.

About the S-1 from the FAA's model table

Type: Fixed-wing, single engine · Piston singles
Power: Piston (reciprocating), 1 engine
Common engines: Cont Motor A&C65 Series (46), Lycoming 0-320 Series (12), Franklin 4Ac199D&E Ser (8)
Seats: 2
Cruise speed: about 77 mph
Built of: steel tube and fabric
Maker on the register: Interstate
Registered: earliest certificate October 9, 1967; newest October 22, 2026

Where they are owner's state

California11Alaska10Washington8North Dakota8Oregon6Ohio6Texas5New Mexico4Colorado4New York3Montana3Kansas3

By state, as a table

	aircraft
California	11
Alaska	10
Washington	8
North Dakota	8
Oregon	6
Ohio	6
Texas	5
New Mexico	4
Colorado	4
New York	3
Montana	3
Kansas	3

Who owns them registrant type

Individual77 (74%)Co-owned13 (12%)LLC10 (10%)Corporation4 (4%)

By owner type, as a table

	aircraft	share
Individual	77	74%
Co-owned	13	12%
LLC	10	10%
Corporation	4	4%

Versions as the FAA records them · click one to list only those aircraft

Version	Registered	Built	Share
S-1A	66	1941 to 1942	63.5%
S-1B1	23	1942 to 1993	22.1%
S-1A-90F	6	1941 to 1942	5.8%
S-1A-65F	5	1941 to 1942	4.8%
S-1B2	3	1974 to 1977	2.9%
S-1A-85F	1	1941	1.0%

When they were built by decade · 20 with no year on file

By decade built, as a table

	aircraft
1940	80
1970	3
1990	1

Registrations by year certificates issued since 2010, including changes of owner · 2026 is the year so far

Registrations by year, as a table

	aircraft
2010	3
2011	10
2012	2
2013	3
2014	8
2015	5
2016	2
2017	5
2018	2
2019	4
2020	1
2021	3
2022	5
2023	7
2024	9
2025	6
2026	7

Registration status

Valid104 (100%)

By status, as a table

	aircraft	share
Valid	104	100%

Airworthiness certificate class

Standard96 (92%)None on file3 (3%)Experimental3 (3%)Restricted1 (1.0%)Multiple1 (1.0%)

By airworthiness certificate, as a table

	aircraft	share
Standard	96	92%
None on file	3	3%
Experimental	3	3%
Restricted	1	1.0%
Multiple	1	1.0%

Biggest operators companies, schools and clubs

Wrong Brothers Aviation LLC2Wright Flight LLC1Sutton Aircraft Salvage LLC1Skywagon Aero LLC1Pacific Coast Air Museum1New Vision Aviation INC1Lost Aviators of Pearl Harbor LLC1Kapellair LLC1Jj Aero LLC1Crestair Air LLC1Coleman Aeromarine INC1Carlyle Properties LLC1

Largest fleets, as a table

	aircraft
Wrong Brothers Aviation LLC	2
Wright Flight LLC	1
Sutton Aircraft Salvage LLC	1
Skywagon Aero LLC	1
Pacific Coast Air Museum	1
New Vision Aviation INC	1
Lost Aviators of Pearl Harbor LLC	1
Kapellair LLC	1
Jj Aero LLC	1
Crestair Air LLC	1
Coleman Aeromarine INC	1
Carlyle Properties LLC	1

Fleet pages: Wrong Brothers Aviation LLC · Sutton Aircraft Salvage LLC · Skywagon Aero LLC · Pacific Coast Air Museum · Jj Aero LLC · Crestair Air LLC

Accident history NTSB records · 17 cases since 1982, 3 fatal

2026-08-01WPR26LA286 · S-1A N37248 · accident near Blackfoot, ID · no injuries

2021-10-02WPR22LA003 · S-1A N37317 · accident near Independence, OR · no injuries

2013-08-17ERA13LA366 · S-1B1 N46336 · accident near Lititz, PA · no injuries

2006-08-01LAX06CA276 · S-1A N28332 · accident near Buckeye, AZ · no injuries

2006-01-31DEN06LA037 · S-1A N28315 · accident near Rocky Ford, CO · no injuries

2005-05-07ANC05LA073 · S-1A N37209 · accident near Palmer, AK · no injuries

2005-04-24CHI05CA108 · S-1A-90F N37395 · accident near Lancaster, KS · no injuries

2002-03-29ANC02LA026 · S-1B1 N48027 · accident near Big Lake, AK · no injuries

The 8 most recent of 17 cases where the NTSB's make and model match this family's versions. Each aircraft's own page also shows its record. How this model compares with others, with the fleet taken into account: Accidents by model in Aviation Analytics.

Questions people ask answers refresh every morning

How many Interstate S-1 aircraft are registered in the U.S.?

104 as of October 26, 2026, counting 6 versions the FAA records separately.

Which state has the most Interstate S-1s?

California, with 11.

Who owns the Interstate S-1?

13% are registered to companies, flight schools, clubs and other organisations; the rest to individuals and co-owners, who are not named on this site at this time.

When were the Interstate S-1s on the register built?

Between 1941 and 1993; half of them in 1941 or earlier.

How many Interstate S-1 accidents has the NTSB recorded?

17 accidents and incidents since 1982, 3 of them fatal. A model flown more shows more; the accident analytics compare models per thousand registered.

What is the Interstate S-1 made of?

The fuselage is a welded steel-tube frame covered in fabric, with metal or wooden wing spars under fabric-covered wings; the fabric is replaced every few decades. The FAA's type certificate data sheet is the authority for any one model.

What the FAA has certified, ordered and been told about the Interstate S-1 the component layer

The fuselage is a welded steel-tube frame covered in fabric, with metal or wooden wing spars under fabric-covered wings; the fabric is replaced every few decades. The design is held under 1 type certificate (A-737, held by Stol Aviation LLC). No FAA order in the current files names this model. 53 approved modifications exist for it, the most by Electronics International.

Approved replacement parts 16 parts manufacturer approvals

Parts a company other than the maker may make for this design and sell as FAA-approved. The companies holding the most:

LP Aero Plastics INC 6 Swift Fuels, LLC 2 Aviation Products Systems INC 2 Uavionix Corporation 1 Whelen Aerospace Technologies 1 Interstate Aircraft CO 1 Electronics International INC 1 Aeroleds LLC 1

Most often: window (2), brake disc (2), windshield (1), va andaccessories (1), spar (1), sliding window (1), skylight window (1), fuel quantity (1), fuel placard (1), fabric (1).

Approved modifications 53 supplemental type certificates

Changes the FAA has approved for this design, from new avionics and engines to floats and parachutes. The companies holding the most:

Electronics International 6 Electronics International INC. 5 Stol Aviation LLC C/O Tom Csatari 4 Aviation Products Systems INC. 3 Airwolf Filter Corporation 3 Visual Instruments LLC 2 Swift Fuels LLC 2 Steve'S Aircraft 2

Latest

2026-07-24SA04837NY · Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and...

2026-07-14SA04652CH · To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification

2025-05-27SA00081NY · Installation of Iceman Aviation Supplies, Inc. Carburetor Ice Detector.

2025-03-01SA7965SW · Application of fabric and polyurethane finishing system.

2025-01-01SA01240SE · Installation of secondary voltage indication system

Certificates and bulletins

A-737Type certificate held by Stol Aviation LLC · 4 models listed · revised October 31, 2007

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.

Connections how the S-1 links to the rest of the register

Design

Interstate 107 aircraft on the register
Interstate S-1A 66 registered
Interstate S-1B1 23 registered
Interstate S-1A-90F 6 registered
Interstate S-1A-65F 5 registered
Interstate S-1B2 3 registered
Interstate S-1A-85F 1 registered
Built of steel tube and fabric

Engines

Continental A65 / C65 series 46 of these aircraft · 65 hp
Lycoming O-320 series 12 of these aircraft · 180 hp
Franklin 4AC199D&E series 8 of these aircraft · 90 hp
Continental C85 series 8 of these aircraft · 85 hp
Franklin 4ACG199H3 6 of these aircraft · 113 hp

Where they are

California 11 of these aircraft
Alaska 10 of these aircraft
Washington 8 of these aircraft
North Dakota 8 of these aircraft
Oregon 6 of these aircraft

Biggest operators

Wrong Brothers Aviation LLC 2 of these aircraft
Wright Flight LLC 1 of these aircraft
Sutton Aircraft Salvage LLC 1 of these aircraft
Skywagon Aero LLC 1 of these aircraft
Pacific Coast Air Museum 1 of these aircraft

Record

NTSB accidents and incidents involving the S-1 17 cases since 1982 · 3 fatal

Airworthiness

Approved modifications for the S-1 53 supplemental type certificates

Analytics

The whole map of how records connect · these connections as data: /graph/model/interstate/s-1.json.

Aircraft newest certificates first · 104

Tail no.	Maker and model	Owner and base	Certificate	Registered	Status
N37414	Interstate S-1A	Individual owner Nevada	Standard	2026-10-22	Valid
N37239	Interstate S-1A	Individual owner Ohio	Standard	2026-09-20	Valid
N49208	Interstate S-1B1	Individual owner Montana	Standard	2026-08-27	Valid
N37317	Interstate S-1A	Co-owned owner Oregon	Standard	2026-08-21	Valid
N537KT	Interstate S-1B1	Individual owner Washington	None on file	2026-07-22	Valid
N37398	Interstate S-1A-90F	Individual owner New York	Standard	2026-07-03	Valid
N28312	Interstate S-1A	Individual owner Kansas	Standard	2026-06-24	Valid
N37205	Interstate S-1A	Sutton Aircraft Salvage LLC Palmer, Alaska	Standard	2025-11-05	Valid
N37235	Interstate S-1A	Individual owner Illinois	Standard	2025-07-03	Valid
N37373	Interstate S-1A	Individual owner Nebraska	Standard	2025-06-21	Valid
N37330	Interstate S-1A	Individual owner Ohio	Standard	2025-05-07	Valid
N37280	Interstate S-1A	Withheld at owner's request	Standard	2025-03-12	Valid
N37426	Interstate S-1A-65F	Individual owner California	Standard	2025-01-14	Valid
N37416	Interstate S-1A	Individual owner New Hampshire	Standard	2024-11-07	Valid
N37217	Interstate S-1A	Individual owner North Dakota	Standard	2024-11-01	Valid
N37383	Interstate S-1A-90F	Individual owner Colorado	Standard	2024-07-04	Valid
N37370	Interstate S-1A	Individual owner Montana	Standard	2024-07-02	Valid
N37286	Interstate S-1A	Co-owned owner Michigan	Standard	2024-05-09	Valid
N6513C	Interstate S-1B1	Individual owner Georgia	Standard	2024-05-07	Valid
N37429	Interstate S-1A-90F	Co-owned owner Washington	Standard	2024-05-04	Valid
N49105	Interstate S-1B1	Carlyle Properties LLC Columbia Falls, Montana	Standard	2024-01-17	Valid
N48027	Interstate S-1B1	Individual owner Alaska	Standard	2024-01-14	Valid
N37262	Interstate S-1A	Co-owned owner Nevada	Standard	2023-11-17	Valid
N28332	Interstate S-1A	New Vision Aviation INC Fresno, California	Standard	2023-08-29	Valid
N37230	Interstate S-1A	Wrong Brothers Aviation LLC Webster, Minnesota	Standard	2023-08-06	Valid
N37231	Interstate S-1A	Wrong Brothers Aviation LLC Webster, Minnesota	Standard	2023-08-06	Valid
N49061	Interstate S-1B1	Pacific Coast Air Museum Santa Rosa, California	Standard	2023-04-12	Valid
N37304	Interstate S-1A	Co-owned owner Texas	Standard	2023-04-04	Valid
N37442	Interstate S-1A	Jj Aero LLC Valley Center, Kansas	Standard	2023-02-02	Valid
N37438	Interstate S-1A	Individual owner Washington	Standard	2022-12-03	Valid
N37436	Interstate S-1A	Individual owner California	Standard	2022-11-09	Valid
N46962	Interstate S-1B1	Individual owner Alaska	Experimental	2022-05-05	Valid
N46023	Interstate S-1B1	Individual owner New Mexico	Standard	2022-03-05	Valid
N37381	Interstate S-1A	Individual owner Iowa	Standard	2022-01-25	Valid
N37294	Interstate S-1A	Individual owner Alaska	Standard	2021-11-02	Valid
N37301	Interstate S-1A	Individual owner Oregon	Standard	2021-04-29	Valid
N37412	Interstate S-1A	Alamo Liaison Group INC San Antonio, Texas	Standard	2021-02-03	Valid
N37407	Interstate S-1A	Individual owner Arkansas	Standard	2020-07-07	Valid
N37248	Interstate S-1A	Individual owner Idaho	Experimental	2019-05-13	Valid
N46243	Interstate S-1B1	Individual owner Oregon	Standard	2019-03-27	Valid
N37411	Interstate S-1A	Individual owner Texas	Standard	2019-03-26	Valid
N43LG	Interstate S-1B1	Individual owner Michigan	Standard	2019-03-12	Valid
N46336	Interstate S-1B1	Individual owner Illinois	Standard	2018-07-06	Valid
N37303	Interstate S-1A	Individual owner Ohio	Standard	2018-06-21	Valid
N37453	Interstate S-1A	Individual owner Ohio	Standard	2017-11-08	Valid
N37335	Interstate S-1A	Individual owner	Standard	2017-08-24	Valid
N3771Z	Interstate S-1B1	Co-owned owner Ohio	Standard	2017-05-09	Valid
N37395	Interstate S-1A-90F	Individual owner Kansas	Standard	2017-05-04	Valid
N37385	Interstate S-1A	Individual owner Wisconsin	Standard	2017-01-09	Valid
N37327	Interstate S-1A	Individual owner California	Standard	2016-11-01	Valid
N51AA	Interstate S-1B2	Co-owned owner Alaska	Standard	2016-08-29	Valid
N37232	Interstate S-1A	Individual owner Nebraska	Standard	2015-11-23	Valid
N28315	Interstate S-1A	Individual owner Texas	Standard	2015-07-13	Valid
N46333	Interstate S-1B1	Co-owned owner New Mexico	Standard	2015-06-01	Valid
N37451	Interstate S-1A	Individual owner South Carolina	Standard	2015-03-13	Valid
N37210	Interstate S-1A	Coleman Aeromarine INC Lakeland, Florida	Standard	2015-02-06	Valid
N37340	Interstate S-1A	Individual owner New Hampshire	Standard	2014-12-15	Valid
N37203	Interstate S-1A	Individual owner Washington	Standard	2014-09-15	Valid
N28319	Interstate S-1A	Individual owner Alaska	Standard	2014-06-12	Valid
N52AT	Interstate S-1B2	Individual owner Alaska	Standard	2014-06-09	Valid
N48652	Interstate S-1B1	Individual owner New Mexico	Standard	2014-04-30	Valid
N47614	Interstate S-1B1	Individual owner Wyoming	Standard	2014-04-03	Valid
N37266	Interstate S-1A	Lost Aviators of Pearl Harbor LLC Bellingham, Washington	Standard	2014-03-28	Valid
N37296	Interstate S-1A	Individual owner Arizona	Standard	2014-02-12	Valid
N37369	Interstate S-1A	Individual owner Oregon	Standard	2013-07-31	Valid
N47513	Interstate S-1B1	Individual owner Alaska	Standard	2013-07-02	Valid
N48443	Interstate S-1B1	Individual owner Colorado	Experimental	2013-01-02	Valid
N28329	Interstate S-1A	Individual owner California	Standard	2012-08-16	Valid
N48616	Interstate S-1B1	Individual owner Washington	Standard	2012-02-06	Valid
N37397	Interstate S-1A	Co-owned owner New Jersey	Standard	2011-10-11	Valid
N37393	Interstate S-1A-90F	Co-owned owner New York	Standard	2011-09-30	Valid
N37401	Interstate S-1A	Individual owner Colorado	Standard	2011-09-26	Valid
N37219	Interstate S-1A	Individual owner Ohio	Standard	2011-05-27	Valid
N37309	Interstate S-1A	Individual owner North Dakota	Standard	2011-05-04	Valid
N37403	Interstate S-1A	Individual owner North Dakota	Standard	2011-05-04	Valid
N34926	Interstate S-1A	Individual owner North Dakota	Standard	2011-04-27	Valid
N37406	Interstate S-1A	Individual owner California	Standard	2011-03-07	Valid
N37241	Interstate S-1A	Individual owner Missouri	Standard	2011-03-03	Valid
N48966	Interstate S-1B1	Kapellair LLC Wickenburg, Arizona	Standard	2011-01-31	Valid
N37400	Interstate S-1A-65F	Skywagon Aero LLC Wilmington, Delaware	Standard	2010-03-03	Valid
N37410	Interstate S-1A	Individual owner North Dakota	None on file	2010-01-27	Valid
N52413	Interstate S-1B1	Individual owner North Dakota	None on file	2010-01-12	Valid
N37432	Interstate S-1A	Individual owner New Mexico	Standard	2008-05-09	Valid
N37382	Interstate S-1A-90F	Crestair Air LLC Dover, Delaware	Standard	2007-09-05	Valid
N2778Q	Interstate S-1B1	Individual owner Illinois	Standard	2007-03-13	Valid
N37452	Interstate S-1A	Wright Flight LLC Medford, Oregon	Standard	2007-03-12	Valid
N28318	Interstate S-1A	Individual owner California	Standard	2005-11-01	Valid
N53250	Interstate S-1B1	Co-owned owner Alaska	Standard	2001-08-29	Valid
N37361	Interstate S-1A-65F	Individual owner North Dakota	Restricted	2001-07-03	Valid
N37323	Interstate S-1A-65F	Co-owned owner Indiana	Standard	2001-01-22	Valid
N37357	Interstate S-1A	Individual owner Washington	Standard	1999-12-13	Valid
N30809	Interstate S-1B1	Individual owner New York	Standard	1998-09-11	Valid
N34939	Interstate S-1A	Individual owner California	Standard	1998-06-11	Valid
N37299	Interstate S-1A	Individual owner Oregon	Standard	1998-05-19	Valid
N37399	Interstate S-1A-65F	Individual owner Missouri	Standard	1997-05-13	Valid
N50AA	Interstate S-1B2	Co-owned owner Alaska	Standard	1997-01-10	Valid
N37435	Interstate S-1A	Individual owner South Carolina	Standard	1996-11-08	Valid
N903Y	Interstate S-1A	Individual owner Texas	Standard	1995-10-25	Valid
N37364	Interstate S-1A-85F	Individual owner California	Standard	1991-11-05	Valid
N37446	Interstate S-1A	Individual owner Idaho	Standard	1990-06-12	Valid