<http://schema.org/description>
"The Flight in the Depression timeline chronicles some of the major milestones in this era of aviation. Highlights include the development of military planes for World War II. Check out the Flight in the Depression timeline."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/transport/flight/classic/flight-in-depression-timeline4.htm>