Originally Posted by
fumje
Call me crazy, but unless you really can't find a home for your GPU (or really need to use the SFO arrivals lounge) I would just fly this in Y. NRT-SFO isn't a terribly long flight, and I would be amazed if the upfare from K to W is less than $400. NRT has nice lounges, so you can eat / drink (/ shower) before the flight.
But ... but ... but, OP is flying with his girl friend (and her friend), what better way to show he's ARRIVED?