As we’ve indicated umpteen times (yes, I, too get tired of having to use that phrase) and as the TSA itself indicates on its own website, photographing, videotaping, or otherwise recording at the TSA checkpoint is legal.
The only time it isn’t legal is when a specific airport indicates by a public sign that that particular airport in that particular jurisdiction has regulations against it. And that’s very few airports.
Read the rest at TSA News [1].