I'm a part time Captain but based on what I made extra in 2024 I'll convert that to a full time FO. For the soft pay (extra pay for over 5 legs, over 5 flight hours, under 12 hours rest and over 12 hour duty day) at FO rates I made $5900. My per diem (Capts and FOs get the same rate) was $6300. So my extra pay at FO rates was $12,200. I could easliy see a full time FO making an extra $24,000 in per diem and soft pay, which doesn't count any Overtime or Holiday days.