Delta's intercontinental awards - IME - typically follow maximum permitted miles rules rather than strict routings. I have never been denied when looking at MPM for a Delta full Y fare between origin and destination cities, although some partner-only cities may lack published fares. In addition to ExpertFlyer, Routing and MPM are commonly found in Delta's View Full Fare Rules, found from the trip summary screen after selecting an itinerary and clicking the hyperlink View Change and Cancellation Policies.