Messing with bluetooth on an airliner isn't going to do anything at all. If they were attempting to spoof GPS or playing with VHF signals that's another issue

Messing with bluetooth on an airliner isn't going to do anything at all. If they were attempting to spoof GPS or playing with VHF signals that's another issue but the flipper isn't capable of that. The TSA also doesn't care, they don't look for, and don't remotely have the training to detect suspicious electronics. Even if they did the flipper looks very innocuous unless you know what it is. You can reliably get much more entertaining things onto airplanes without them batting an eye.