Celestar340: please tell me more about that upgrade possibility when checking in late with Thai as a StarAlliance-Gold (UA 1K) member. What do I need to do when flying paid business and hoping for 1st? (do I need any voucher or miles, or just my word and Goldcard and the luck of an empty seat?
Thai did upgrade me last year (october 98) on a preissued eco-boarding pass at Taipeh, going to Bangkok, when I presented my StarAlliance one-way upgrade voucher (the original eco-boarding pass was issued by UA in SFO).