Andrew Huang opens his small black suitcase. He snaps on a few propeller pieces, locks in a battery pack and then a camera.

A few taps on his tablet, and his SkyRanger drone is suddenly airborne, moving vertically up, flying high over a parking lot, snapping video and pictures below.

High-tech drones have entered the modern lexicon. Hobbyists are playing with small toy versions. Pilots are complaining about them entering their airspace, putting commercial jets at risk. Even e-commerce giant Amazon is trying to figure out how to use drones to make deliveries.

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