The new, as yet un-designated X-plane, will stretch 94 feet in length and be capable of speeds up to Mach 1.4 at altitudes up to 51,000 feet. The Department of Defense will eventually decide what number the X-plane will eventually carry. Although the aircraft design Lockheed signed on for was finalized a year and a half ago, a NASA spokesman said there have been very few changes to the product since then. One goal of this X-plane program was to make the aircraft as affordable as possible. In order to keep that promise, Lockheed plans to use the landing gear from an F-16, a canopy from a T-38 and a GE 414-400 turbofan powerplant similar to the one on board the F/A-18 E-F Super Hornet.