03/18/2010 05:12 am ET Updated May 25, 2011

Where's My Flying Car? Why Winged Automobiles Are Still Grounded (PHOTOS)

Advances in composite materials and recent modifications of Federal Aviation Administration requirements have lowered some of the barriers of entry into this slow-moving market. Today, there are at least 12 U.S. firms working on flying car prototypes.

But only one, Terrafugia, expects to deliver its product to customers in the near future -- and that's still two years away.

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