A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
I've been DM since the beginning of DM around the time of the merger and on my last flight, KLM said that I was a base or general member on my boarding pass and on the flight manifest.
So my answer to the OP's question would be never.