Originally Posted by
akonradi
You can access any Delta lounge at JFK, or the Oasis lounge in terminal 4. On the return from Toronto, there won't be any lounge available to you, as Delta/SkyTeam does not have one in the US departures area.
However, there's a transborder Plaza Premium lounge in Priority Pass, although IIRC the last time I used the AA lounge with Priority Pass before my DL flight.
Check delta.dumb carefully for lounge access rules. I'm not sure Canada counts as international and when I last looked, only certain transborder flights seemed to allow lounge use based on GM and PM status.