<a href="https://en.wikipedia.org/wiki/NASA" id="mwAS4" rel="mw:WikiLink" title="NASA">NASA</a> conducts the <a href="https://en.wikipedia.org/wiki/Controlled_Impact_Demonstration" id="mwAS8" rel="mw:WikiLink" title="Controlled Impact Demonstration">Controlled Impact Demonstration</a>, wherein an airliner is deliberately crashed in order to test technologies and gather data to help improve survivability of crashes.