If we have green bars it's because the lines are built to less than guarantee. Guarantee in a 31 day month is 89, a 30 day month is 87. If the credit of all the trips for the month in that line is built to 70...they add a "green bar" on your monthly payroll report of either 17 or 19 depending on the days of the month to get you to guarantee. You can work as much as you want beyond that up to FAR limits or sit back and relax knowing you're flying 50ish hours and getting paid almost 90...either way you keep the green bar.