Thanks, everyone. No chance of postponement. Need to be in ULN next week ASAP. I changed my routing to IAD-LAX-SFO-PEK-ULN, which gets me out of IAD later and, thus, into PEK on the afternoon of the 8th. So, I'll only have a 5-hour layover at PEK with no need for a visa. All segments except LAX-SFO were upgraded, so not a bad solution. And, I pick up an additional 1,200 EQMs.
jiejie's suggestion was a good one, but I thought the 1130 Air China flight to ULN was sold out on the 8th. It wasn't, but I only found that out after making my change. That would have been ideal, as I would get into ULN at a much more reasonable hour.
Thank you all again.