I've never had a problem with my 3D cube in security. It's so silly to think that they'd complain that the bag is too small!
TSA has stated randomly assigning Pre-check to travelers, even if they haven't requested it through their airline or enrolled in a program. I just got my Global Entry, as I *never* got Pre, even though United told me that I've been "approved." Hubby and the kids always whisk through the Pre line, while I am left behind. I'm excited to join them! I'm thinking that they're going to need to expand the Pre lines soon, as they seem to be lengthening by the day as people join the program.
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I got Global Entry a few months ago and am looking forward to trying it out shortly. I have used the Pre-Check privileges before, however, which are wonderful, aside from getting asked a couple time if I really was Pre-Check. (The TSA agent looked almost disappointed when I showed him my bp).