I think that I have heard DL will put ex-TWA 757 is:

JFK-HEL
JFK-LYS if DL will ever reinstated once again but, I remember DL has been discontinuation due to low-yield. It wasn't profitable for JFK-LYS is terribly loaded.
JFK-GLA
JFK-ARN
JFK-CAI
JFK-NBO
JFK-LED
JFK-GVA
JFK-NAP
JFK-ZAG

There is something else more specific good routes will be taken ex-TWA 757 or 763ER some bigger cities in EU. DL should be good enough for ex-TWA 757 some European cities. I'm concerned about DL will gets more new international flights next week.

DL is already previously announced for JFK-TLV while ago but, DL will inaugurate flight on March 10, 2008. I know DL will put on equipment is 763ER without payload restrictions.