I think it's the one with the rear all "coned" up so no engines showing, that they used to stack on top of a 747 and then release it to test how it glided back to earth.
And, ya the REAL Enterprise seems like a million years away. Hell, we can't even build a shuttle right anymore. Consider this is 2005 a couple decades later & we STILL can't build 'em right!
Forget flying cars or any of that crap. We'll extinct ourselves as a race if we try any of that sh*t. Guess we'll have to start talkin' "flying cars" closer to the *next* millennium, eh???