A LONG TIME AGO, AS FAR AS 1977

LUKE: Vader's on that ship.

HAN: Now don't get jittery, Luke. There are a lot of command ships.

Keep your distance though, Chewie, but don't look like you're trying to keep your distance.
CHEWIE: Huuuurgh Huuurhg, aaahhuigh !!!!!
HAN: I don't know. Fly casual