ANSWERS: 2
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If there were no passages then maybe - You would need food, water and disposal of sewage besides fuel.
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To the best of my knowledge, the only 747's that are capable of in-flight refueling are the ones operated by the U.S. Air Force for the use of the President of the United States. These aircraft are designated VC-25 by the Air Force. http://www.af.mil/factsheets/factsheet.asp?fsID=131
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