A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,012
For what it's worth, I've done open-jaw and stopover travel with other alliances as well. It's not just a Delta thing.
Fall is usually a good time to book European award travel - I've done quite a few premium-cabin awards or paid+upgrade trips. I'd expect that it's at least reasonably open, with a couple months' notice and some date flexibility.