Skylab was the United States' first space station, and the second space station visited by a human crew. It was also the only space station NASA launched alone. The 100-ton space station was in Earth's orbit from 1973 to 1979 and it was visited by crews three times in 1973 and 1974. [Wikipedia]
Ares I-X was the first test flight in the Ares I program, a launch system for human spaceflight currently under development by the United States space agency NASA. Ares I-X was successfully launched on October 28, 2009. [Wikipedia]
The Grumman X-29 experimental aircraft, with forward-swept wings and canard control surfaces. It has computerized fly-by-wire control, and the wings are made of composite materials. It first flew in 1984.