Like it or not, private drones are coming to U.S. airspace. The only question is how soon that happens.

With companies like Amazon.com and Google advancing plans to use small unmanned aerial vehicles for commercial purposes, pressure is mounting on the Federal Aviation Administration (FAA) to quickly release rules governing private drone use.

Just last week, Google disclosed details of a hitherto secret program dubbed Project Wing under which it wants to use small unmanned aircraft to deliver lightweight emergency supplies to disaster zones and isolated areas.

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