FlyerTalk Evangelist & Ambassador: China
Join Date: Aug 2005
Location: DEN
Programs: DL DM/MM, UA 1K, AA Exp, HH Dia, WOH Glob, IHG Plat, Marriott Gold, NA EE, Hertz PC
Posts: 17,494
OP, first if you have EF use it (or expedia) to pull fare rules and see what kind of routing rules DL has on this route.
Then use Matrix ITA to your advantage by using language like "dl dl+" to add more segments.