Because of the amount of flying I do, I get upgraded a lot and I used to see them all the time. They were actually quite easy to find. They got on before the general boarding. They had aisle seats in first class. And, they usually left their jackets on.
That profile actually caused the marshalls themselves to complain that they were too easy to peg. For the last few months, I have not been able to pick them out at all. I think they are varying their dress and their MO
a lot more now and it is probably for the better. After all, if I could peg them, so could you know who....