Originally Posted by
MaCrOs
Cost per Available Seat Mile will always be lower at the regional compared to the mainline.
https://seekingalpha.com/filing/3723642
See the AA SEC filing. mainline CASM is about 10 cents, regional is 16.
If you only have 40 customers, it's still cheaper to fly a 60 seat plane at 0.16/ASM than a 120 seat plane at 0.10/ASM.