Wave your arms in the right way, and a drone taxiing along a runway will stop, turn and find a parking spot. Drones can already land autonomously on aircraft-carrier decks, but humans control them during taxiing. With piloted aircraft, navy flight-deck marshals use a codified set of hand gestures to instruct pilots to, for instance, cut their engines, open weapon bay doors or move to a refuelling bay.
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