330-PS-4015 (SC 357492):   First Mail Delivery by Helicopter Between Cities.   A New York to Washington, D.C. flight by an U.S. Army Helicopter H-19 marked the first mail delivery in the U.S. between cities by helicopter.  Shown here after the craft arrived at Potomac Park, Washington, D.C. are Mr. John Deming (in the plane) of the New York State Department of Commerce and Mr. Harmar Denny, Vice Chairman of the Civil Aeronautics Board, May 15, 1953.  (4/28/2015).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/127906254@N06/17127250919/">330-PS-4015 (SC 357492)</a>