One reason probably is those 320s are oooooold. The second is AA only purchased 319s and 321s and therefore anything they didn't choose doesn't fit their model. Frankly, as long as they have a net gain of aircraft and they pay the same, I don't care what kind of an 320 family it is. Hey APA, let's try to get the 321 into group three pay. If the rumors of removal of the mid cabin lav are true and they pack in even MORE passengers, they're pretty much in 757 territory *(Yes, I am well aware the 757 is a way more powerful airplane and NOTHING is REALLY in 757 territory.)