Billy shoes + TSA
Just a little FYI... I wore my Billy hi-tops, and they got flagged by the full body scanner. I had to take them off and put them through the x-ray machine and go back through in my socks.
I don't have CP or wear any orthotic devices, so this may not apply to you.
If you do have orthotics, remember that you can request an alternative screening and don't have to remove anything.