Atlantic-Fokker C-2A "Question Mark"

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.

Ben Branch Profile Picture Silodrome - Operation Question Mark
Founder & Senior Editor Silodrome

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.

Silodrome was founded by Ben back in 2010, in the years since the site has grown to become a world leader in the alternative and vintage motoring sector, with millions of readers around the world and hundreds of thousands of followers on social media.

Published by Ben Branch -