I still have 2 vouchers left from the free 4 vouchers that were distributed to Star Alliance Gold Members in the UK. I now have a flight in January to Bangkok with Lufthansa in Class Q. Would it be possible to upgrade to Business class on the Munich -> BKK leg if there were free seats available ? I have read a few articles on the forum stating that you can only upgrade from a high economy booking class to business class. Is class Q high enough ?