These small remote-controlled aircraft have become common enough for some people to do races with them:

The Drone Racing League | The Premier Drone Racing League.

From "About":
WHAT HAPPENS WHEN YOU COMBINE THE THRILL OF STAR WARS POD-RACING WITH THE REAL WORLD ADRENALINE OF FORMULA 1?

DRONE. RACING. LEAGUE.
DRL is the global, professional drone racing circuit for elite pilots.

With custom built racing drones traveling 90 MPH+, pilots race FPV (First Person View) through the most insane 3D courses ever created outside of a video game.