To my eyes, the Transformers combine three things guaranteed to hit the hot buttons of little boys everywhere: cars, fighter planes, and giant robots. I thought Optimus Prime counted enough as a car to qualify for the list. If we did a top planes list, a Decepticon could make it on there, though the only one I know by name is Starscream and I thought he was kind of lame.
There is no ordering intended for either the winners or the runners-up, which is why I wrote "in no particular order" before leaping into both lists.
IMO, there is a distinction between a flying car and a plane. The flying vehicles in something like Blade Runner or The Jetsons or the DeLorean in the Back to the Future sequels aren't planes or spaceships -- they're cars that go airborne. It's splitting semantic hairs, I know, but that's why the Jetsons' car could make the list while something like Spike Spiegel's Swordfish II couldn't.
Not to say that there won't be future top planes or top spaceship opinion pieces in the future, but if we did, then the Jetsons car would be disqualified from both of those lists.
While I'm at it, Benny the Cab did come up in discussions, as did a few others already mentioned. We just ran out of room, and I'll freely admit that the selections for the runners-up list was pretty arbitrary. Surprisingly, I don't think anybody mentioned the Simpsons' station wagon.
I don't mind if people disagree, but if you do, then tell us your ideas for replacements. It's all meant in fun.
-- Ed