Patsy is an American stunt plane that was said by Lionel as being a Pitts Special. She appeared in the episode Skids, Stunts and Soap when she visited Harefield Airfield whilst on her way to an air show in France.
Patsy explains that she loves throwing herself about and not doing stunts can make her feel boring. She can also be rather competitive as proven when she and Pippa had a stunt contest, which ended up with Pippa feeling ill
As stated above, Patsy is based on a Pitts Special which were designed aerobatic stunts.