Or the other planes go as fast as they can, and the jet flies slow enough for it to equal it's speed with the other planes. I'm only assuming that this is the case because I wasn't there (duh), but I'm sure computer systems had something to do with it.
But seriously, those jet fighters are HUGE! (From the perspective of the camera, or they're actually giants.) The p-51 looks dwarfed compared to the f-22!