The Circus-Boat is "The Greatest Circus Boat on Earth!"...According to Ming-Ming.
The Circus-Boat has a diffeernt base than the other Flyboats. The base is red, but it seems more of an oval shape than a frisbee circle. Also, the base has stars along the side and purple padded seats inside. But the base still has the same wheels, gears and rockets as the orginal. The mast holds up a sort of circus-tent-styled umbrella that is purple/yellow striped with lights along its side, a red flag with a glowing yellow pole top and the "W" logo.
The Circus-Boat has only appeared in Join the Circus!