Originally Posted by
saulblum
Therefore (and I am not a lawyer) I find it hard to believe that a TSO or passenger would have any expectation of privacy at a checkpoint.
This. I work in the security industry and a key part of my job is informing customers of legal applications of devices. If there is no expectation of privacy, then by definition you cannot be eavesdropping or surreptitious.
Also, the laws for audio and video recording/photography are different, so if you want to take photos, this is a bit of a moot point.