<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Traveling Salesman:
The same rule applies if you have a presidents club membership or an amex card. You cannot use a club unless you are flying on their airline that day. So you would have the same problem at MSP if you had a presidents club membership.</font>
That's not actually correct. At least as of last year, a CO PC member (or a NW WC member) has reciprocal lounge access, even when not flying that airline that day.
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CO plat, UA prem; Marriott plat, Hyatt plat, Hilton gold, Starwood gold, Fairmont gold; Avis select, Hertz 5-star, all the others base level...