Originally Posted by
elmetal
Not just that, but also making sure to abide by ICAO rules internationally (someone must be under 60 in the cockpit if someone is over 60) and no green on green.
But also bid avoids bid prefers and stuff like that.
Those constraints could be solved with FO schedules first. The only real reason is that the commodore will blow up if you don't (and of course it's just specified that way in the UPA)