Public domain
P-51 ("Mustang") fighter planes being prepared for test flight at the field of the North American Aviation, Inc., plant in Inglewood, Calif.
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineP-51 ("Mustang") fighter planes being prepared for test flight at the field of the North American Aviation, Inc., plant in Inglewood, Calif.. 1939-01-01. Palmer, Alfred T.. FSA/OWI Color Photographs, Library of Congress. Public domain.