“The Federal Aviation Administration has said that online shopping powerhouse Amazon may not employ drones to deliver packages, at least not anytime soon. … The revelation was buried in a FAA document (PDF) unveiled Monday seeking public comment on its policy on drones, or what the agency calls “model aircraft.””

Source: arstechnica.com

URL for FAA document mentioned above:

http://www.faa.gov/about/initiatives/uas/media/model_aircraft_spec_rule.pdf