Originally Posted by RamenNoodles

Was just chatting with a friend about this and wanted to share:

Section 25.P.2

Captains Flying as First Officers

a. A reserve captain may be required to fly as a first officer if no
reserve first officers are available to fly an assignment.

b. If both crewmembers are on reserve, the more senior reserve
(by pilot system seniority) will designate who will be captain and
first officer.

c. If the other crewmember is a lineholder, he will be the captain.

d. A reserve captain will not be required to fly more than 20 hours
as a first officer in a month.

e. The pilot will be paid and credited as a captain for the first
officer assignment.

f. A pilot retains the responsibility to determine if an assignment is
safe, and may reasonably refuse an assignment to fly as first officer.