what the feds have commissioned to fly over the USSA, but a lot of the drones in service now range from hundreds of thousands of dollars to millions. many have a ceiling of well over 10k feet. and this is what they use when they're just toying around murdering arabs... it would be pretty easy to find that altitude sweet spot where almost no one could hit it from the ground and still be fully functional and cost effective.
check out some specs:
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