Don't forget about FAR 121.436:

(a) No certificate holder may use nor may any pilot act as pilot in command of an aircraft (or as second in command of an aircraft in a flag or supplemental operation that requires three or more pilots) unless the pilot:

(1) Holds an airline transport pilot certificate not subject to the limitations in §61.167 of this chapter;

(2) Holds an appropriate aircraft type rating for the aircraft being flown; and

(3) If serving as pilot in command in part 121 operations, has 1,000 hours as second in command in operations under this part, pilot in command in operations under §91.1053(a)(2)(i) of this chapter, pilot in command in operations under §135.243(a)(1) of this chapter, or any combination thereof. For those pilots who are employed as pilot in command in part 121 operations on July 31, 2013, compliance with the requirements of this paragraph (a)(3) is not required.