A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,404
Is this an award ticket? If so, remember that DL can create space on flights it operates, but there might not be award seats available with DL miles on partners?
Shouldn't the plan be to switch to a simple RT ticket to LHR and back? I don't see why you're trying to add a segment.