Just watched a History Channel UFO special. During the cold war, we were trying to develop a plane that could fly over Russia, basically spying on them without ever being seen. What we had invented, was the U2. But, Russia had a missle system that shot down one of our planes, so the U2 was scraped. The U2 was responsible for half of all the reported UFO sightings in the 50s and 60s. They said is was made from polished alimunum, so the reason you saw things in the sky was because it flew so high up (60K ft.) that you actually saw the sun's rays deflect off of it.
Then, we developed the SR-71, like Jin said. Those are the only 2 things that were proven to come out of Area 51, or at least released.
But keep in mind, for every successful aircraft, comes many unsuccessful ones. And come on now, you really don't think we gave up on that plane, do ya?
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