True, but at least with TSA, I don't know that they'd be able to legally enforce it or legally defend it if someone were to challenge it in court on the premise of equal access.

I was told by a TSA agent once that if a non-status passenger could somehow push their way past the contracted boarding pass checkers stationed at the beginning of the security line and ended up in the elite line, TSA could not legally refuse them access to security (assuming they had a valid ID and BP) or tell them they needed to go back to the regular, non-status line. He wasn't clear if it was a legal thing or if it was because TSA only "owned" the facilities after the first TSA podium and the airport/airlines "owned" the actual space that the stantions that form the security lines are on, but I'd guess it could be either one.