https://www.ainonline.com/aviation-news/business-aviation/2007-03-27/gulfstream-demonstrates-quiet-spike-potential-supersonic
Gulfstream Demonstrates 'Quiet Spike' for Potential Supersonic Bizjet | Aviation International News
Gulfstream Aerospace hosted a NASA F-15 in Savannah, Ga., on February 14 for an aerial demonstration of its Quite Spike telescopic nose spike installation.
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