Nope, rejected! The guy said the MLL was a "private" lounge and the Amex would only get me into the "public" lounge that was landside. I wasn't really sure what he meant but didn't have all that much time before my flight so I just moved on. Maybe this guy was in a bad mood; he didn't let the guy in front of me in, either. (That guy was *G, but didn't have his *G card, only a luggage tag with his *G number, which the guy at the front desk said was insufficient.)