If you are speaking of restored passenger aircraft, there are two that come to mind. One is the Lockheed 1049 Super G Constellation based at the Airline History Museum at Kansas City, Mo.
The second....and probably the very best of any restoration regarding aircraft, is the Pan American Boeing 307 Stratoliner which is nearly ready for roll-out at the Boeing facility in Seattle, Washington. This aircraft, like the Constellation, is restored to flying condition and will probably do some fly-bys before being turned over to its owner, the National Air and Space Museum. The Clipper Flying Cloud will be on display at the NASM annex at Dulles International Airport. It will also be the very first NASM aircraft to be open for public tours.