Originally Posted by sambb

I am looking, to know subjectively, which NA gateway maybe the best for a C upgrade to cdg. I usually fly to LHR, so direct to CDG will be a new experience for me. I am aware that no one can predict upgrades (not even HNL's upcheck), but has anyone noticed a particular route seems more available than others?
For example, my ORD-LHR upgrades, particularly on the latest 11pM flight seem to go through more commonly than the evneing flights....
I am looking for some general guidance on a nearly unpredictable situation.. Some info is often better than none....