North American Product Classification System (NAPCS) Canada [Provisional Version 0.1]
- 54 - Professional, scientific, and technical services
- 541032 - Engineering services
- 541032.1 - Engineering services
- 541032.1.4 - Transportation engineering projects
541032.1.4.2 - Aviation facility engineering projects
All engineering services related to airports, runways, hangars, and other aviation facilities.
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