It was stated in another topic:
AA tried using 757s in its 2-class configuration this past summer on the JFK-SFO route, and the negative response was so overwhelming, 767s were put back on the flights flown by the 757s.
What was the negative response, specifically. Did it have to do with going from 3 to 2 classes of service? From widebody to narrowbody on a trans-con?