Originally Posted by georgetg

70 capped at 102
153 76-seat max

with every 717 or A319 1.25 76-seater added
max cap of 223

reduction of 50-seaters
for the first 40 76-seaters, reduce 50-seaters by 11.1 units
for the next 30 76-seaters, reduce 50-seaters by another 10.7 units (22 total)

only after the last 76-seat jet is delivered and 76-seater count reaches 223 must the 50-seaters be reduced to 125

so roughly 350 50-seaters now
add 55 717 or A319
bring 76-seaters up to 222
50-seters reduced to 320-330

only after the 56 717 is delivered and the last of the max 223 76-seat jet is delivered will 50-seaters be reduced to 125.