Tethered to the ground from almost 2 miles up? I'd imagine this would require a decent sized exclusion zone for air traffic.
Also, there's always going to be some wind aloft pulling the blimp away from its anchor. It would be interesting to see a risk assessment for the land immediately surrounding the anchor point given the worst case of the cable separating from its attachment point on the blimp.
Ah, the sectional I was viewing on flightaware.net didn't show that note. I was just reading[1] how a similar aerostat is flown from Cudjoe Key, Florida by the DEA. That one appears to be marked in its own 4 mile wide zone.[2]
Also, there's always going to be some wind aloft pulling the blimp away from its anchor. It would be interesting to see a risk assessment for the land immediately surrounding the anchor point given the worst case of the cable separating from its attachment point on the blimp.