Such blimps can keep surveillance and ordnance-guiding equipment aloft for a few hundred dollars an hour. They cost hundreds of thousands, not millions, of dollars. And they can stay in the air for more than a week, whereas most drones fly for no more than 30 hours at a time. They are also easy to deploy, because no airfield is needed. A blimp can be stored in the back of a jeep, driven to a suitable location, launched in a couple of hours and winched down again even faster.

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