14 C.F.R. § 71.13 Classification of Air Traffic Service (ATS) routes.
Title 14 - Aeronautics and Space
Unless otherwise specified, ATS routes are classified as follows: (a) In subpart A of this part: (1) Jet routes. (2) Area navigation (RNAV) routes. (b) In subpart E of this part: (1) VOR Federal airways. (2) Colored Federal airways. (i) Green Federal airways. (ii) Amber Federal airways. (iii) Red Federal airways. (iv) Blue Federal airways. (3) Area navigation (RNAV) routes. [Doc. No. FAA–2003–14698, 68 FR 16947, Apr. 8, 2003]
Title 14: Aeronautics and Space
PART 71—DESIGNATION OF CLASS A, B, C, D, AND E AIRSPACE AREAS; AIR TRAFFIC SERVICE ROUTES; AND REPORTING POINTS
§ 71.13 Classification of Air Traffic Service (ATS) routes.

