Originally Posted by
Kiwi Flyer
Many lounges do not require the physical card, but many others do (e.g. UA domestic lounges and LH).
I think it depends. None of the UA domestic lounges I've been to required a physical card and the airports include ORD, LAX, SFO, BOS, SEA, ATL(when it was still open), etc. Having "Star Alliance Gold" written on the BP was sufficient.