Originally Posted by
mtkeller
Do a booking on delta.dumb. Pull up the fare rules via the view change and cancellation penalties link. Click the button for full fare rules. Search for MPM
That works for tickets that are dummy-bookable on delta.com. (It meets the test of free!) Some partner fares and partner-carrier-only-served destinations will require an alternate resource. ExpertFlyer, looking at the routing rules of a full Y fare, is my go-to.