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:
united airlines unitedairlines boeing theophilus lee boeingtheophiluslee lee tlee training dougals dc dougalsdc dc dc douglas dst douglasdst dst douglas aircraft company douglasaircraftcompany douglas aircraft douglasaircraft douglas aviation aircraft airplane ual airlines airliners Photo from an Album presented to Theopilus Lee upon