CNN CNN Newsroom March 17, 2014 14:22:00
The flight of the plane of this. if you have a plane flying along at 35,000 feet using fuel for 7 1/2 hours, yes, it flies for a very long time. that is not true if you have a plane flying for a different level. now, you are burning an extraordinary amount of energy. you may be having 30%, 40% efficiency you had at 35,000 feet. planes are meant to fly at the stratosphere. so much more density of molecules. fly low to the ground as mary pointed out, you are going over the himalayas.