Originally Posted by APC225

Reserve are generally 10% of the total pilots. 360 EWR 737 FOs.

The union has the flight hour numbers but averages don't tell the story. Once they've got a reserve on a trip there is a tendency to keep using him vice using a fresh, much lower time reserve, because they tend to hold a non-flying reserve back just in case. Kind of like hoarding, except with human beings. Consequently you can have guy breaking min guarantee of 72 hours, while another hasn't flown in 6 weeks.