I go through airport security all the time with all sorts of rPI's and Arduino's often wired to buttons and IMU's and various SDR Radio's.. Every time I put them in my bag I think "this is the one that's going to get me stopped". Not even a sideways glance from the scanning operators.

I often go through with things in static protection bags, sometimes big bundles of LED strings and again nobody stops me.

I'm not sure if I'm happy because I don't have to explain the things in my bag or worried that they're looking for stuff so specific that someone with 1/2 a brain could build something that would get though easily...