Maybe not news to many, but Delta still has excellent nonstop J award availability to Europe and beyond from many hubs in July/August. I compiled a list of international flights (mostly on Delta metal, but also VS and VA). Please see if you can add partners flights where there is good availability. My full article is
here.
JFK
A lot of roundtrip availability for TWO to the following cities (and more).
LHR (plenty on VS)
MAN
FRA
ZRH
MAD
KEF
DAK
BOS
AMS
LHR
ATL
LHR
MAN
ZRH
GRU
DTW
LHR
FCO
GRU
CVG
CDG: decent availability, not great
MSP
LHR: decent, not great
SLC
AMS
LAX
LHR
SYD (great availability on VA and decent on KE via ICN)
WLG (VA via BNE)
SEA
ICN (on DL, didn't find KE).
Seattle is the worst for Europe. Zero to very little availability.
If you've found other international J seats on partners (especially the ones without YQ) post them here.
Delta SkyMiles 2015: Agonized, Tantalized and Analyzed — Part 2: Hub by Hub in Maps and Details