Hello, I'm quite new to this whole adventure and I would love get some advice. I was planning on flying from LAX to PEK this winter break (late December to early January) to visit my grandparents. I know these plans are a bit last minute, but I was hoping to get two business class tickets. I signed up for the Amex SPG and Chase Sapphire Preferred this August, so now I have about 43k in UR and 34k in Starwoods. I know that this isn't even enough for one ticket, but is it advisable to just purchase tickets and then upgrade? (If so, which airline?) Or should I just buy economy tickets and save my points for later use? My father has about 150k in UA miles that I could possibly use as well. Thanks!