APA used to probably view that data to the membership. Status 15 report. If it’s still provided to the members I can’t find it. The last Status 15 report under the Ops Analysis Page is September 2015.

aapilots crew age by fleet shows you the number of pilots in each fleet. AMR 10Q(K?) report should have the fleet totals.

Off the top of my head G2 is typically around 12, G3 around 15-16, and G4 21-24.