Philadelphia, United States of America
The Budd BB-1 Pioneer was an experimental United States flying boat of the 1930s utilizing the Savoia-Marchetti S.56 design. Its framework was constructed entirely of stainless steel, using the shotweld method of welding that alloy.
Listen to the audio guide for Budd BB-1 Pioneer Aircraft Free on WIP — starts by itself when you arrive, even with the screen off