you should be able to get lucky. they usually do not know rules are dependant on where your ticket pass through. when they see you go to USA, you'll get 2 bags.

actually, no. originating from brazil you get 2 bags
quote: http://www.klm.com/travel/br_en/prep...s/exbag_BR.htm since it's from a brazilian agency i dont think there's much debate there. you might have to hint them you're going to the Americas when you check in at BKK so should be piecewise, but that should suffice.