In 1929 some of the first attempts at refuelling planes in flight were being undertaken. This famous photograph of Operation Question Mark shows a 10,000lb Fokker C-2A being refueled in flight by a modified Douglas C-1 transport aircraft.

Read more about the history of mid-air refuelling here.

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Ben Branch has had his work featured on CNN, Popular Mechanics, the official Smithsonian Magazine, Road & Track Magazine, the official Pinterest blog, the official eBay Motors blog, BuzzFeed, and many more.

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