| X-54 | |
|---|---|
| Role | Experimental aircraft |
| National origin | United States |
| Manufacturer | Gulfstream Aerospace |
| Status | In development |
| Number built | 0 |
The Gulfstream X-54 is a proposed research and demonstration aircraft, under development in the United States by Gulfstream Aerospace for NASA, that is planned for use in sonic boom and supersonic transport research.[timeframe?]