It's not. (unless of course you are talking to capncrunch). The 757 is included with the 76ER. It's a matter of perspective. If the 757 is included with the 76ER, it brings the NWA 757s up to DAL status of the aircraft. If the 76ER is included with the 757, it downgrades the ER to fit the lame argument of super duper uber ultra gigantico premium flying that capncrunch would have you buy into. I don't care what he thinks really... I know that he and his fellow narrowbody guys are (regardless of methodology) going to be able to hold widebody flying that they cannot now hold.

The 764 is a different animal avionics wise. Different glass and cockpit setup. It is actually more similar to the 777.