<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by chalf:
Amex Platinum also provides some lounge access benefits--IIRC day-of-travel access to DL, CO, or NW lounges. The UK Amex Platinum also incudes free Priority Pass membership.</font>
Note that this applies only to "real" AmEx Platinum, the one with a $350/year fee in the U.S. Other platinum-colored cards issued by American Express, such as Hilton and Delta cards, do not have the same benefit (or fee).