Image: BellX1

Description: Bell X-1 in the National Air and Space Museum, Washington DC. The Bell X-1 was a joint NACA-U.S. Army Air Forces/US Air Force supersonic research project and the first aircraft to exceed the speed of sound in controlled, level flight.
Title: BellX1
Credit: Own work
Author: Ad Meskens
Permission: Notification/copy of publication is appreciated The copyright holder of this file allows anyone to use it for any purpose, provided that a mention to "Ad Meskens" be included. Usage notes: • If the work requires attribution, use instead • If this is your own work, please use instead Please check that the conditions given above are compliant to the Commons licensing policy. Most importantly, derivative work and commercial use must be allowed.  Copyrighted free use//commons.wikimedia.org/wiki/File:BellX1.jpg
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes