Unless I am requesting a jump-seat, I make the greatest effort to travel "under the radar." I don't walk around with my ID badge showing and if at all possible get out of the monkey suit. In fact, I will venture to say that most airlines will state somewhere in their manuals that they want their employee non-revs to be inconspicuous. But you still see folks out of uniform with their ID's out for full display. There is always that assumption that when you are in uniform or with your ID hanging, you are non-reving. There are many out there that are not always familiar with crews traveling on paid tickets. Keeping it low profile and simple works best.