Originally Posted by
dlflyer00
Why do you think this is a correction? SC memberships are also restricted to same-day Delta/partner flights. There is no difference.
SC membership gives access to a couple other lounges (AF at CDG IIRC, for example) that don't accept the DL Reserve card (with a SkyTeam flight) for access. This would only help if the passenger is in coach or PS and isn't GM+ or maybe for a GM+ on a domestic AF flight.