Nope, I'm going alone

I'm looking forward, though, to meeting the Tgirl group when I get there.
Don't worry too much about the TSA.... Have your doc write the letter as per the State Department guidelines for a passport and you'll be fine..
I have a friend who's brother actually works for the TSA... According to him, it's really not a big deal. Just be up front (if they ask) about being Trans.