Wright brothers

Orville and Wilbur Wright were two American brothers, inventors, and aviation pioneers who were credited with inventing and building the world's first successful airplane.

They first appeared in "Arthur's Snow Biz" where they both argue about the other brother getting a longer turn riding the airplane.

The brothers were also seen in the opening of "What's Cooking?" demonstrating that trial and error eventually results in success. In this appearance, they did not speak, instead having background piano music in the style of a silent movie.