The owner's signboard which describes N4770C, the only surviving Boeing YL-15. Photographed at EAA AirVenture 2018, Oshkosh, Wisconsin, United States of America.
<a href="//commons.wikimedia.org/wiki/User:SteveTheAirman" title="User:SteveTheAirman">J. S. Bond</a>
<span class="int-own-work" lang="en">Own work</span>