Phineas and Ferb showing off The Flying Car of The Future, Today.
The Flying Car of the Future Today, was one of Phineas and Ferb's inventions. They made it out of Linda's car. Candace piloted the car, with Jeremy as a passenger. Shortly into the flight, Candace began looking at Jeremy instead of where she was flying, resulting in the car striking a tree and a crash on the edge of a cliff. The car later fell off the cliff. The car slightly veers to the right. ("Phineas and Ferb Get Busted") Since the episode turned out to be a dream, it is unlikely that it was built in real life.