Originally Posted by
mfullmer
Now, I've also flown several times with a friend, who was seated next to me. We have never been in the same zone.
There are several plausible answers for this, including the notion that one would want to load the window seat (perhap you) before the center or aisle (your friend).
I haven't seen DL make public its plan aircraft by aircraft, but it doesn't logically follow that DL lacks a plan.