Here's a question for all of you FAR 121 guys. Because of our recent BK filling, several guys were asking interesting questions.

The designated PIC is the PIC and logs PIC. What does the 2nd Capt log? PIC or SIC. Can the 2nd Capt log all of the time or just the time in seat? How about the FO's? Time in seat or all of the flight time? Can there only be one SIC?