A Douglas <a href="//commons.wikimedia.org/wiki/C-54_Skymaster" title="C-54 Skymaster">R5D-4 Skymaster</a> on display at the Castle Air Museum in Atwater, California.
<a href="//commons.wikimedia.org/wiki/User:Nehrams2020" title="User:Nehrams2020">Nehrams2020</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>