All Nippon Airways Mileage Club - B Fares (Can I upgrade?)

I am on a W/K fare right now.

SFO-NRT-LAX

I would like to move to a B fare for *A upgrade purposes.

Anyone able to do this? Any cost estimates?

[KVS Availability Tool 5.1.0/Platinum - Sabre: Fares/DotRes/US] (http://www.KVSTool.com/?R)
LAX Los Angeles Int'l CA US [KLAX]
NRT Tokyo Narita JP [RJAA]
THU 01 Oct 2009 | THU 15 Oct 2009 | R/T | Economy

Carrier From To Fare Cur Fare Basis
--------- ------ ---- -------- ---- -------- --- -- ----------
NH LAX NRT 690 USD WXDPUF
NH LAX NRT 790 USD HXDPUF
NH LAX NRT 940 USD KXDPUF
NH LAX NRT 1050 USD SLXUSJ
NH LAX NRT 1338 USD BKXAP
NH LAX NRT 1500 USD EXSPEJE
NH LAX NRT 2040 USD YXPEJ
NH LAX NRT 3755 USD Y2XRT
NH LAX NRT 4882 USD Y2XOW
NH LAX NRT 6175 USD YXRT


Some example fares i pull up... i'm not sure if you can upgrade your ticket or not