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: 102,617
DL SC day passes and single entrance passes are generally good only for genuine SCs.
DL had been using third party lounges in HKG, such as the QF lounge, but I think this practice has ended and they now send their passengers to the AF lounge.
There might be PriorityPass lounges you could use if you're a member or even lounges that let you pay for admission.