After my experience, I do have some advice for trans travelers. If you wind up in line for a body scanner, be aware that you can ask to skip it and have a pat-down. If you do go through the scanner, if you look back at it you will see a small simplified display with an outline of a body, and colored rectangles over any detected “anomaly,” which will let you know, if you are called aside for further screening, what part of your body they will focus on. You can then, if you wish, pre-emptively state to the agents that you are wearing a binder or breast forms or whatever seems the likely issue. I’d suggest calmly stating that TSA policy forbids requiring a passenger to reveal or remove a prosthesis. You also have the right to request a private screening (although, if the TSA agent seems hostile and you fear mistreatment, a public screening may in fact be safer, even though it involves more public stares).
For now, anyway, as trans people we have to deal with a system that treats us as potential terrorists because of our bodily differences, which is nonsensical and insulting.