<http://schema.org/alternativeHeadline>
"A specialized version of the company's P12 jetpack, designed for first-responder emergency crews and the military, will be ready by summer 2014."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/transportation/stories/martin-aircraft-called-your-jetpack-is-almost-ready>