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Flying circuits

From Futurepedia, the Back to the Future Wiki

"'The lightning bolt shorted out the time circuits and destroyed the flying circuits. Unfortunately the car may never fly again.' It actually flew?"
—Doc reading the letter his older self sent from 1885.

Flying circuits were inserted into the DeLorean time machine in 2015 to enable it to fly in addition to tires that rotated to provide upward thrust.

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