PA
-between Area 3 and Area 1 via Pacific
(other than between SWP and South
America via North America and North/
Central Pacific)
-not applicable for routings on non-stop
services between Canada/USA and South
Asian Subcontinent
-between TC1 and TC2 (via the Pacific and
TC3)
PN between South America and South West
Pacific via North America but not via Area
3 except SWP