Aug. 18 - Inflatable aircrafts have been around since the Montgolfier brothers developed the first untethered hot-air balloon in 1782, but 200 years later, they are making a high-tech resurgence for both civilian and military use. U.S. aerospace company Lockheed Martin's version is called the P-791 airship, which it hopes is about to take off. Rob Muir reports.
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