right, but at least A321 has a comparable seat capacity; 220 v 245
instead B739 will reach maybe just 205 seats,
you can afford losing 20-25 seat but probably not 40!
I do think 737 will never be a 757 replacement, no way...
Even A321 can't do that but, at least in capacity, you can compare them.
just my two cents...
cheers
