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:
smithsonian institution smithsonianinstitution pilot airmail usps postmaster thomas g. patten thomasgpatten curtiss jnh curtissjnh jenny washingtondc torrey h. webb torreyhwebb lieutenant torrey h. webb lieutenanttorreyhwebb airplanes biplanes pilots airmail pilots airmailpilots airmail airplanes airmailairplanes post office department