What Happened To The Gulfstream X-54 Quiet Supersonic Demonstrator?

The Gulfstream X-54 is a proposed experimental aircraft under development (with no announced timeline) by Gulfstream Aerospace. The sonic boom business jet is being researched as a demonstration aircraft for NASA for supersonic transport. Initiated in 2008, the aircraft is designed to have an acoustically-shaped sonic boom to minimize the effects of noise.

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