I've never had much problems using my miles to upgrade my tickets. However, I am flying from LGA to ORD to HKG in less than two weeks and I am still "waitlisted." What surprises me is that I have no problems clearing for F on the LGA - ORD sector but I've been waitlisted for the ORD - HKG sector even though the C cabin is wide open with over 40 seats remaining. What is going on? Do they really expect to sell that many seats in the next couple of days? Any suggestions to make them clear my upgrade?

Thanks!