Vzducholoď USS Macon nad New Yorkem roku 1933 U.S. Naval Historical Center Photograph - https://www.history.navy.mil/content/history/nhhc/our-collections/photography/numerical-list-of-images/nhhc-series/nh-series/NH-43000/NH-43901.html, Public Domain, https://commons.wikimedia.org/w/index.php?curi