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1.
The idea of a cheap family vehicle that uses powered flight instead of rolling along on the ground. Popularized by cartoons and science fiction, it was widely expected in the late 20th century to become a reality "real soon now."

In common usage, it represents a shattered hope for the future.
Carbon nanotubes? That's great, but where's my fucking flying car already?
by Nomikos September 26, 2006