Originally Posted by
UAL250
I would actually think IAH is an easier route to upgrade than NRT-EWR/SFO, but I am not an expert. Good luck.
IME, it's rare to find R space on NRT-IAH. When I've looked, the availability is, more-or-less in order, NRT-GUM, NRT-LAX, NRT-DEN, KIX-SFO, HND-SFO, NRT-ORD, NRT-SFO, NRT-IAD, NRT-IAH, NRT-EWR, NRT-HNL. (Admittedly, I don't always check NRT-HNL, because R space ex-HNL is so hard to find).