Originally Posted by
Nugget_Oz
Doesn't require linking of reservations just an interline agreement. You could check whether they can be tagged through.
Also the OP should check whether the DL flight is actually going to arrive into T4 as that is where the majority of their flights go.
I think the reservations do need to be linked otherwise the originating airline's computer system can't know or see the final destination. That's required to get a bag to that place.