Aviation meet postal card
Miss Katherine Stinson flew a sack containing 537 pieces of mail from the Tucson, Arizona, fair grounds to Tucson's post office, a distance of about five miles, where she dropped it to waiting postal officials. The flight was part of the November 5, 1915, Southern Arizona Fair Aviation Demonstration. The Post Office Department officially designated this mail flight as Route No. 668,001.
A variety of the postmark has been noted. This has an indentation near the right end of the lowest killer bar. It is believed that this variety occurred by using the (damaged) postmarking device many years after the fact.
This example, a postal card addressed to Mr. Russel Hartman, Altoona, Pennsylvania, bears handwritten notations in pencil - "Nov. 5, 1915" and "US Aero Postal Station / Southern Arizona Fair Grounds." It also bears a double strike of the magenta-colored postmark - "US AERO POSTAL STATION / NOV 1915 / TUCSON, ARIZONA." The straightline killer bars cancel the 1-cent Lincoln indicia.
