This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
balboa park balboapark san diego air and space museum sandiegoairandspacemuseum aviation san diego sandiego roosevelt field rooseveltfield standard standardj cole palen colepalen paul mantz paulmantz nd hispano hispanoe Repository San Diego Air and Space Museum Archive Repository San Diego Air and Space Museum Archive