Initiated during 2008, the X-54 project is intended to produce an experimental aircraft capable of supersonic speeds with a formed sonic boom that is acoustically shaped to mitigate noise pollution.
[1] The X-54A is intended to demonstrate low-boom sonic effects in population impact studies in support of future supersonic transport design and regulation.
The X-54A was reported as being developed by Gulfstream Aerospace and is intended to be powered by two Rolls-Royce Tay turbofan engines.
[11] The designation "X-54A" was issued during 2008, but NASA stated it was considered a "placeholder" and was not actively cooperating with Gulfstream on the project.
[12] As of late 2012 there were indications that Gulfstream was close to announcing the design of a quiet supersonic business jet.