Fifty-five years ago, today, the short, animated film Just Plane Beep was released. Produced by David DePatie & Friz Freleng and, directed by Rudy Larriva, Paul Julian was the uncredited voice of the Road Runner.
Synopsis from the Looney Tunes Fan Site (possible future broken link as Fandom is in the middle of a migration):
Wile E. Coyote chases Road Runner on foot but, Road Runner produces dust and runs off the side, smacking the coyote against a wall. While lying down on the ground, a paper for Acme War Surplus is blown towards the coyote and he sends a coupon in the mail. He receives a World War I bi-plane kit and plans to catch the Road Runner using it.
Needless to say, things don’t go well. ~Vic
Additional Reading & Sources:
Big Cartoon Database
IMDb Movie Connections List
Internet Animation Database
Looney Tunes & Merrie Melodies Filmography 1965 (Wikipedia)
Wile E. Coyote & the Road Runner (Wikipedia)