File:021007-O-9999G-121.jpg

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Description
English: A 10,000-pound Fokker C-2A is refueled in flight by a modified Douglas C-1 transport aircraft during an operation dubbed Question Mark in 1929. A large question mark was painted on each side of the receiver aircraft's fuselage, intended to "provoke wonder at how long the aircraft could remain airborne," according to Air Force history experts. The Douglas C-1 aircraft were transformed into aerial refueling tankers by installing two 150-gallon tanks for offloading and a refueling hose that passed through a hatch cut in the floor of the aircraft. During the operation, which began on New Year's Day in 1929 and ended 150 hours and 40 minutes later on Jan. 7, two Douglas refueling aircraft passed 5,660 gallons of fuel. All tolled, the tankers completed 43 sorties, 12 of which occurred at night. Although not the first aerial refueling, the Question Mark operation was certainly not the last.
Date
Source http://www.af.mil/shared/media/photodb/photos/021007-O-9999G-121.jpg
Author Unlisted USAAF personnel

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Public domain
This file is a work of a U.S. Army soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.

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current16:03, 23 December 2008Thumbnail for version as of 16:03, 23 December 20083,329 × 2,400 (937 KB)Sv1xv (talk | contribs){{Information |Description={{en|1=A 10,000-pound Fokker C-2A is refueled in flight by a modified Douglas C-1 transport aircraft during an operation dubbed Question Mark in 1929. A large question mark was painted on each side of the receiver aircraft's fus

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