A bit off the point here but it is PC. I see *A has just changed their website to include paid club access as P.C. is acceptable. They replied to a question why Maple etc had been listed and not PC and said they would change -appears to have been done in last 24hrs - well done *A.
Eligible Paid Lounge Membership Customers include United Airlines Red Carpet Club, US Airways Club - Star Alliance Upgrade, Air Canada Maple Leaf Club – Worldwide and Continental Airlines Presidents Club.