- "'The overload shorted out the time circuits and destroyed the flying circuits. Unfortunately the car will never fly again.' It actually flew?"
- —Doc reading the letter his older self sent from 1885.
Flying circuits were part of a hover conversion job Doc Brown had done to the DeLorean time machine in 2015. These enabled the car to fly, in addition to tires that rotated to provide upward thrust. The DeLorean's flying circuits were unfortunately destroyed by a gigawatt overload caused by it being struck by lightning in 1955, which in turn sent it and Doc back to 1885.