Originally Posted by
jackal
Except that in this case, they won't. As long as you have a boarding pass for that day at that airport, TSA policy is to allow you access to any checkpoint at that airport. At best, they may advise you that you're not at the correct checkpoint, but they will not deny you access.
This has been confirmed to be official policy by several TSA employees here on FT as well as a more official source (the TSA blog, IIRC).
So it's not like CDG, where you can only access the concourse from which your flight departs, but you can go through security at any terminal at the airport from which you are departing?