18,000 ft = 5.5km. I think that it's a respectable range for the Mini 2 considering that these aren't near perfect conditions when flying. I think that it says a lot abovut how much the Mini 2 has improved. I'd love to see someone test out the 10km range, however, but that would take maybe attaching a second battery to the drone. Can it be done? Has someone actually done it?