Wow, I am surprised at the idea that I would need to pay the US price if I change the routing in the US. I always thought the key was whether I am changing the first segment, not whether it's already been flown. I thought that the only difference between before departure and after departure was whether there's an additional $125 fee. And as long as you don't change the first segment, the place of the routing change doesn't matter. Has anyone been charged the higher price when not changing the first segment?