I'm trying to book a first class ticket from HKG-SEA, can I do HKG-BKK-FRA-SEA? If so, can I book in Y now for the FRA-SEA segment and later when O space open up and change to O without paying a change fee? Of course the entire itinerary has to be charged with first class miles now. Is that too big of a jump from Y to O? Thanks.