Well, DL finally retiring the 767-200 was probably the main reason that finally made this distinction possible. Also, I wouldn't be surprised once DL refits 767-400ERs with BizE that they will use a different code, likely 765, for them as well.
Originally Posted by alb222
Notice also flights with the 757. Flights are listed as either 757 or 752 to distinguish beteen mainline and Song aircraft after May 1.
752= Song Aircraft
757= Mainline Aircraft
I have seen this in the schedules as well, though distinguishing between 752s and 757s is not that easy to do. In the case of the 763ERs, there are 6 ex-Gulf Air planes, and currently there are 5 daily flights with those in the timetable. Now with the 757-deal, it is not that obvious, as it there are significantly less flights denoted as "752" in the schedule than there are Song 757s. There were roughly 50 of them, yet there are only roughly 75 "752" flights in the schedule, and I doubt that DL was that fast to reconfigure Song planes back to mainline
. Though as new schedules come out, it should also be more clearly visible.