A HS-2L Flying Boat in the air over Florida in the 1920s. The aircraft was designed and built by the Curtiss Aeroplane Company using duralumin, a lightweight aluminium alloy. Image from U.S. Navy National Museum of Naval Aviation.

A HS-2L Flying Boat in the air over Florida in the 1920s. The aircraft was designed and built by the Curtiss Aeroplane Company using duralumin, a lightweight aluminium alloy.

Image from U.S. Navy National Museum of Naval Aviation.