Moderator, All Nippon Airways and Japan
Join Date: Sep 2005
Location: TYO
Programs: NH SFC (*G), JL JGP (OWE), AS MVP, WOH E, IHG SE
Posts: 3,908
Sorry, I am mistaken -- it is indeed based upon the actual travel distance. I was looking at some outdated information from when JAL started allowing one-way itineraries.