Cabbie

Cabbie Volthomas is the (hidden) main villain in the 2014 Planes sequel Planes: Fire & Rescue.

Planes: Fire & Rescue (Official Bio)
A jolly old ex-military transport plane, Cabbie used to drop airborne utility vehicles behind enemy lines in Korea. Now he drops the Smokejumpers at Piston Peak—it’s a lot like combat, but nobody’s shootin’ at him. With a payload of 10,000 pounds and a maximum takeoff weight of 74,000 pounds—Cabbie can carry the smokejumpers up to 2,000 miles away.

Cabbie is a member of The Smokejumpers, an organization working to fight against wildfires.

Planes Fire & Rescue
Cabbie is going to spy after every plane to kill them and become the hero of Piston Peak.

Trivia

 * He appears to be modeled after a Fairchild C-119 Flying Boxcar.
 * By a disney email he is going to be the villain of the film. however, no one knows if it's true.