I flew American Airlines for the first time on one of their Boeing 737-800s that’s been converted to a “Project Oasis” interior — meaning it’s been retrofit to have the same lack of legroom and smaller lavatories (but larger overhead bins) as their new Boeing 737 MAX aircraft.
I wrote only days ago that these are planes to avoid but right now it’s really difficult to do so. You book a flight on a 737, and there aren’t enough ‘new’ 172 seat 737s to know consistently where these torture tubes are going to turn up. If you get one of the torture tubes, your seat assignments may wind up messed up, too.