Of course who doesn't know that voice? Jetfire doesn't even need specialized equipment to know who it is that is heading his way.

"I'm not at all surprised to see you here as well, Starscream."

Disaster kind of goes with the other jet, after all. Disaster and destruction, anyway. There is kind of a lot of that surrounding them. It makes Jetfire wonder if his old friend had something to do with the state of this planet. While Starscream may want to rule over the universe, Jetfire also knows how ruthless and spiteful the other can be.