Spy Planes: The Future Of Technology Documentary

A surveillance aircraft is an aircraft used for surveillance—collecting information over time. They are operated by military forces and other government agencies in roles such as intelligence gathering, battlefield surveillance, airspace surveillance, observation, border patrol and fishery protection. This article concentrates on aircraft used in those roles, rather than for traffic monitoring, law enforcement and similar activities.
http://www.youtube.com/watch?v=_b-JCZc4GAI&list=UU-JBgg_36D88GL735QUZVzg