Something posted in another thread aroused my curiosity. With respect to the free lounge passes some credit cards provide (United's Chase card and US Air's Barclay card come to mind), must one show anything more than the pass and ID of some sort to access the lounge, or must you also be flying either on the airline whose lounge you're entering or at least on the alliance? In other words, has anyone tried (for example) using the free United Club pass when one is flying on American that day? If so, what was the result? I'm curious, because usually an airline lounge requires showing not only an elite card from the airline or at least the alliance, but also a same-day boarding pass on the airline or at least the alliance. In my experience, even if you're a member of the club/lounge (e.g., United Club member or AA Admiral Club member) they ask to see the boarding pass as well as the membership card (unless you're there for a meeting, as an exception). It would be very interesting if that rule did not apply to the complimentary passes issued by airline-branded credit cards.