DL used B764 to JFK today as well as the 763 to ATL. Wonder when that'll change.
Had a look and they have scheduled a mix of 752, 763 and 764's over the next while before a 752 for around a week and then 763 again. ATL see's a mix of 763/4's also until late May when both 763 swap duties in DUB for a few months peak summer. DL normally use 752's for April, September and October and 767's at other times. Little odd 752s are required during the summer and not for winter.
Because they will have elsewhere to put the aircraft, they suspended last winter and can just about make 752 work in summer. Starting DUB was somewhere to replace the aircraft from BRU.