As this is not Delta-specific, I am moving the thread to the TravelBuzz Forum.
Obscure2k
Delta Moderator
It was enforced by a DL connection employee on a DL flight, posted by a DL medallion who flies exclusively on DL and has never seen this enforced on DL before. I'd say this is DL specific.
I don't care what Qantas, Hawaiian, United, etc say about this rule.