Today's NYT has this story about airplane-cars:
http://www.nytimes.com/2014/08/24/au...pgtype=article
A key paragraph:
"NASA and the Federal Aviation Administration are working on a GPS-based technology called an Automatic Dependent Surveillance-Broadcast, or A.D.S.-B., receiver that would help multiple light aircraft coordinate flight paths and request changes. The proliferation of gasoline-electric hybrid drive componentry in the auto industry could also help get weight and complexity out of powertrains."
Some images of the "Airphibian" (discussed in the story), taken off the open internets: