This United States event cover commemorates the First Flight Inaugurating Air Mail Service between Salt Lake City and San Diego, California, dated June 4, 1930. The cover features a striking printed cachet depicting wings with the event text encircling "Salt Lake City - San Diego" and the date, making it a notable piece for aviation and philately enthusiasts. The cachet celebrates the historic milestone in U.S. air mail history.

The postage includes a 5-cent U.S. Air Mail stamp (Scott #C7) featuring a classic biplane in flight, canceled with a rectangular San Diego, California air mail slogan postmark reading "AIR-MAIL / SAVE TIME." The circular date stamp postmark is from San Diego, California, dated June 4, 1930, at 5 PM. The cover is addressed to Francis H. Swan of Topeka, Kansas, typed neatly on the front. This cover is an excellent collectible for those interested in early U.S. air mail, aviation history, and event covers with official postal markings and event cachets.