My two ThankYou Points favorite transfer partners are Singapore Airlines and Air France Flying Blue. (milevalue.com)
My current favorite transfer options for Chase Ultimate Rewards points are Singapore KrisFlyer and Korean Air SkyPass, or to top up a United MileagePlus account. (travelsort.com)
In general, Virgin Atlantic is not our favorite transfer program, and we don't recommend using it for international travel. (creditdonkey.com)