SIC 3721 — Aircraft
Description & Classification
SIC code 3721 representing 'Aircraft' is an industry category in the Standard Industrial Classification (SIC) system under U.S. OSHA and Federal procurement registers.
Modern NAICS Crosswalk
Trace the modern equivalent classifications in the 2022 North American Industry Classification System (NAICS) database:
- NAICS 541714 - Research and Development in Biotechnology (except Nanobiotechnology) (via SIC1987:3721→NAICS1997:54171→2002:541710→2007:541711→2012:541711→2017:541714→2022:541714)
- NAICS 541713 - Research and Development in Nanotechnology (via SIC1987:3721→NAICS1997:54171→2002:541710→2007:541711→2012:541711→2017:541713→2022:541713)
- NAICS 541715 - Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) (via SIC1987:3721→NAICS1997:54171→2002:541710→2007:541712→2012:541712→2017:541715→2022:541715)
- NAICS 336411 - Aircraft Manufacturing (via SIC1987:3721→NAICS1997:336411→2002:336411→2007:336411→2012:336411→2017:336411→2022:336411)
Classification Details
| SIC Code | 3721 |
|---|---|
| Industry Title | Aircraft |
| Division | Division D: Manufacturing |
| Major Group | Major Group 37: Transportation Equipment |
| Source / Verified | US Census 1987 SIC Concordance / 2026-06-28 |
Related Resources & Compliance Guides
Further regulatory reference links for legacy SIC code 3721:
- SIC Codes Complete Compliance Guide — Detailed history and active legal applications of the SIC classification framework.
- Why Legacy SIC Codes Persist Guide — How credit systems and the SEC still rely on SIC metadata.
- SIC ↔ NAICS Crosswalk Tool — Trace industrial code conversions dynamically.
- SIC Major Group 37 Hub — View other legacy industries in this business division.
Related Industries in Major Group 37
Frequently Asked Questions (FAQ)
What industry does SIC code 3721 represent?
SIC 3721 is 'Aircraft', a 4-digit Standard Industrial Classification (SIC) code under Major Group 37: Transportation Equipment (Division D: Manufacturing); it maps to modern 2022 NAICS code(s): 541714 (Research and Development in Biotechnology (except Nanobiotechnology)), 541713 (Research and Development in Nanotechnology).
What is the modern 2022 NAICS mapping for SIC 3721?
SIC code 3721 maps to modern NAICS codes: 541714 - Research and Development in Biotechnology (except Nanobiotechnology), 541713 - Research and Development in Nanotechnology, 541715 - Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology), 336411 - Aircraft Manufacturing.