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Sept. 19, 2012: An F-15E Strike Eagle receives fuel from a 100th Air Refueling Wing KC-135 Stratotanker during a training mission over the Atlantic Ocean. (© Ethan Morgan/U.S. Air Force via Reuters)

How it might have looked: The McDonnell Douglas Blended Wing Body Concept (BWB)

Sept. 13, 2012: A Tiger Eurocopter flies during the International Air Show at Schoenefeld Airport in Berlin. (© Rainer Jensen/DPA/Zuma Press)

Drakens over Sweden. These jets look like they're from Battlestar Galactica.

Great State of Maine Air Show

Air Force Thunderbirds Great State of Maine Air Show

Thunderbirds Great State of Maine Air Show

Great State of Maine Air Show

An F/A-18 Hornet was photographed just as it broke the sound barrier. When an airplane travels at a speed faster than sound, density waves of sound emitted by the plane cannot precede the plane, and so accumulate in a cone behind the plane. When this shock wave passes, a listener hears all at once the sound emitted over a longer period: a sonic boom. As a plane accelerates to just break the sound barrier, however, an unusual cloud might form. The origin of this cloud is still debated.

Air Force officials are still determining why an Air Force C-17 Globemaster III cargo jet heading to MacDill Air Force Base instead landed at Peter O. Knight Airport.

US Air Force Thunderbirds F-16