We are currently booked in early December from NYC to Paris. We are on BA: EWR to CDG, BA First ORY to EWR, OpenSkies Premium Economy. Cost was a bunch of miles plus about $1400-1500 in fees. I see that I have four Delta Platinum Systemwide Upgrade certificates. And it seems that coach fare on my dates is about $1700 total for two. So it seems to make sense to get all my miles and cash back (less $150) and book economy Delta, using the four certificates for upgrades for my wife and me to Business. Does this make sense? Am I missing something? What would you smart people do? Thanks!