>>Uhhh....I thought that was part of prefight? Oh, I guess you have people for that Tim.<<

Yeah, well the way it works is the Captain is responsible to be in the **** during pre-flight, and has to deal with people issues during boarding, flight attendants, loading, clearances and routings, etc. while one of the 2 copilots is outside doing the walk around, checking tires, etc.

On airplanes (most Domestic) that only have one copilot, the Capt. and Copilot usually alternate on who does the walk around.