Thundercracker recognizes his friend's buddy.  He spoke briefly to Drift once or twice before, but back then, the mech had seemed closed and defensive, very different from the mech who'd arrived this time.

  That was not, in the least, a bad thing, in Thundercracker's estimation.  If nothing else, it made him far more approachable.

  And on that note, with the obvious invitation, he does just that, circling back around and dropping altitude in lazy corkscrews until he was low enough to transform and drop the rest of the way to land on his feet.  He nodded greeting.  "Drift."