Originally Posted by
MSPeconomist
My guess would be yes. IIRC there have been reports of cancelled Reserve cards failing to work for SkyClub access almost immediately.
The DL Amex linkage is very strong - and I think you do not need to show the card - but I suggest to always carry it if you want a benefit from it.
I am not clear if the ticket has to be paid by the card.
In the case of AA and Barclays - the ticket has to be paid by the card to work (and in my experience the primary card holder has to be traveling)
I may have got a bad AAgent but while I paid for the award ticket fees for my mother in law with my Barclays card (as an AU) they still insisted on her paying for bags - but that was a couple of years ago prepandemic