Originally Posted by
NYCflip
Call your medallion line. You should be able to link your PNRs for companion upgrades. I have flown with my sister on separate PNRs and have been successful in linking our PNRs and getting upgrades and/or EC seats. Only possible if you call.
Or tweet @DeltaAssist to do this more efficiently than calling. Give them both PNRs and request link and companion upgrade.