Fliers are rare among us, too, but there are a few. Still... I'm a bit of an odd case. I come from, well, earlier. [He grimaces a little.] I crashed on Earth before the war started. I wasn't very hurt, but I did end up in stasis.

By the time I woke up, there was a shortage of energon in Cybertron, so both the Autobots and Decepticons had left to find better energy sources. That's how they ended up on Earth too.