The math on the 90% checks out. The "fixed" percentage for FOs? Not so much. First year us about 34% of CA, 2nd year is about 49%, 3rd year 57%, 4th 61% and 5th 63%. That's a pretty varied "fixed" percentage. The percentages match for both fleet types, so the formula for arriving at FO pay is certainly off of a percentage, but it looks like the percentage changes from year to year. To me, a "fixed" percentage would be "FO pay is 60% of CA pay."