and are able to stay in the air much longer than its predecessors.  The Global Observer built by AeroVironment Inc. of Monrovia, California can remain aloft for days at altitudes exceeding 65,000 feet.

Other drones being tested at Edwards Air Force Base, in California are the Northrop Grumman X-47B and Boeing’s Phantom Ray.  These two, jet engine powered drones are capable of carrying over 4000 pounds of weapons.

Read more at: http://articles.latimes.com/2011/jan/11/business/la-fi-drone-warfare-20110111