The 737-800 seats 155 in two classes.
The 737-900 seats 169 in two classes.
The 737-900ER seats 173 in two classes.
(These are CAL's configurations)

All certified ETOPS and FL410.

The potential savings over the MD-80's adds up. Imagine 29 more paying people on a plane that burns less. More money for American.

I hope it works out and no one ends up on the street. Good luck.