Skyhook container; photo courtesy National Postal Museum

In the 1930s, U.S. postal officials tried different ways of moving the mail. One technique was called “skyhooking,” which brought the mail to rural towns that had no adequate railway or highway mail routes. Unfortunately, the towns which needed this type of service usually did not have adequate landing fields for planes.

Although a low-flying airplane could simply drop a sack of mail onto the ground, the tricky part was getting ground mail into the moving plane. The Railway Mail Service’s successful on-the-fly mail exchange system provided the inspiration for an aviation experiment. Mail would be “caught” by a plane flying overhead and reeled up into the plane. Of course, catching the mail was not going to be easy. Continue reading →