Question maybe for https://travel.stackexchange.com/
But maybe Bitcoiners will know - have you ever flew with AntMiner in a hand luggage?
Does airport security ask any questions?
These questions are much better posed to the TSA.
You may transport this item in carry-on or checked baggage. For items you wish to carry on, you should check with the airline to ensure that the item will fit in the overhead bin or underneath the seat of the airplane.
To help officers get a clear look at your bag and reduce the need for additional screening, we suggest you pack your bag in neat layers (layer of clothes, layer of electronics, layer of clothes, layer of shoes, etc.) and wrap cords tightly around electronics items.
Even if an item is generally permitted, it may be subject to additional screening or not allowed through the checkpoint if it triggers an alarm during the screening process, appears to have been tampered with, or poses other security concerns. The final decision rests with TSA on whether to allow any items on the plane.