Clacko, don't know if you were asking me or the OP, but in my case I have an Adria LJU-MUC flight that connects to a MUC-ATL Delta flight, If the Adria flight is late/cancelled, will they rebook me on Delta? I bought the ticket on Travelocity.

This is part of round-trip ticket. The whole itinerary appears on the Delta website when I access my reservation.