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It seems that the flight took place in the center of Russia near the Siberian city of Strejevoï. The regulation in Russia doesn’t mention an altitude limit for drones. But if this flight was not illegal, was it dangerous? After all, the drone flew close to most airliners’ cruising altitude. However, the commercial jet traffic in this region is very limited and most transcontinental flights crossing between Europe and Asia fly at higher altitudes to maximize fuel consumption. In any case, don’t try this at home and stay clear of aircraft routes.
SOURCE: A Small Hobby Drone Reaches 33,000 Feet