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 omaha airmail usps plane wagon truck mail early aviation earlyaviation postal service postalservice nebraska . am am u.s. mail usmail biplane package del labor aviation us postal service uspostalservice airplane mail delivery maildelivery pilot letter frank yager frankyager de havilland