as others have posted, the yellow tag is the way to go and it is the first thing i look for and it does work in spotting and being spotted . i have been also been "busted" onboard by giving out tootsie-pops by at least 4 f/t'ers and by one f/a who spotted my f/t pin as i entered the a/c (and credit to this f/t'er & f/a as it was a 6am flight sfo-las and i think he was one of the very few folks with their eyes completely open at that ungodly hour )