I should add, when I booked it, I asked for a particular JFK-LAX flight that was available in C and the agent offered me F on a later flight, (I told her I wanted a later flight, but this is the latest one I see) she said very clearly that domestic F is permitted on an international C award, and she confirmed that it still priced as C, 62.5k. I confirmed over again that domestic F is permitted on intl C award, she told me at least 3 times, I might have recorded the call.