If you have a Thailand-issued Citibank Gold Visa, you can enter TG Biz class lounges at BKK airport... you also have access to First Class "Louis Tavern" lounges at BKK....

Also, if you have a Thailand-issued Citibank Platinum Visa, you have additional access to the Cathay Pacific First Class lounge at BKK (its small but usually not crowded and has very nice dim sum and two fast internet terminals)

I cant wait for the new BKK airport to open late this year? I heard the new TG lounges will be great!