I carried on a 2 meter radio once. It was in the original box. There was a big discussion. The box went through the x-ray machine a few times. Then I was allowed to take it on board. This was pre 9/11.
Another time, I checked a HF rig. It was in it's original double boxes. I taped a QSL card to the top of the radio.
TSA opened both boxes then wrapped about 50 feet of TSA security tape around both boxes.
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