AIP Gen 3.2 -3
The following designators are used to identify ATS conventional and Area Navigation routes:
a. Conventional Routes:
Regional routes A, B, G and R.
Domestic routes H (one way) & J (two way). Domestic routes V (one way) & W (two way) - predominantly low-level.
b. Area Navigation Routes:
Regional routes (Tasman) L, M, N & P.
Domestic routes Q (180_ - 359_), Y (360_ - 179_), T (two way) & Z (low level).