I had a similar issue (sfo-tyo)- but in my case they eliminated F (where I was booked) - AS wanted to put me on another flight in C but I, too knew to ask them to reroute me through LA (where F was available but not for award) - they also said 5-7 days (I think that's the guide line) but I got confirmation much more quickly too. It pays to know what to ask for! (they didn't think JL would do it and tried to dissuade me)