The Club America lounge is a tiny, dark, claustrophobic place tucked into a corner just past the security entrance to the UA concourse. It's worth the walk out to the RCC at the end of the UA concourse -- their lounge is much nicer. I haven't been in MIA since 9/11, but you used to have no problem getting through security to use the RCC with your *G card and a boarding pass (has this changed?).