Given how notorious Brazil is for its lines, I do think it is good they give priority to certain categories in every day situations (like supermarkets). However, I agree they have taken these priority categories to ridiculous levels, with some categories being open to interpretation as to what qualifies, and everyone knows the airplane staff just wants to board the plane (and is not going to question why certain people are in the line). Combine those factors, with the Brazilian way (stereotypically) to bend rules to the max, and you have ½ the plane trying to use the priority line! I had to look up that last category (the ribbon): it is for blood donors. So, go give blood, and you too can apparently join the priority line if you do not otherwise qualify.