Originally Posted by
lucky9876coins
They typically only allow one connection each way, which makes it hard to somehow manipulate routings, as some would call it.
It's been several years since I had DL status, but at the time (don't know if this is still the case, though; take it with a grain of salt), DL's SkyMiles program rules had something in them about not adding segments just to get more miles.
Edited to add: from the
SkyMiles rules, it says:
However, use of connecting itineraries in lieu of nonstop and/or direct flights for the accumulation of additional mileage is not permitted. Delta reserves the right to limit mileage credit for an itinerary to the number of connecting flights actually traveled or the maximum number of segments shown in Delta's published schedule for a connection between any two cities, whichever is less.
Apologies for diverging into DL and MR discussions in the UA forum.