Hey, just had a simple question.
Was listening to the KORD air traffic feed for about the past hour and overheard--during some air to ground communication--something to the effect of "not at liberty to say" when (I think) the control tower was requesting information from the plane. Control tower asked them to repeat, and the plane again mentioned they're not really at liberty to say I thought that was kind of weird because that doesn't seem typical, but google didn't show much of anything. Then a few minutes later I checked current FAA flight delay information map, noticed ORD was a little bit delayed, and the reason was "OTHER: VIP".
So just out of curiosity, would communication involving "not at liberty to say" involve a VIP flight, or is this just another way of them saying they don't have the information requested? I'm not particularly familiar with plane communications.