http://www.airspacemag.com/flight-today/how-things-work-whole-airplane-parachute-67493177/?no-ist#ooid=x1a3F0MTos6TPBP78kYbHc4X6wf7rqM1
http://www.smithsonianmag.com/innovation/will-commercial-airplanes-have-parachutes-someday-180949373/?no-ist
http://www.bbc.com/future/story/20131223-should-planes-have-parachutes
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