Join Date: Dec 2010
Location: MSP
Programs: AA EXP, DL PM (FO soon), A3 Gold, TK Classic Plus, SPG Plat, HH Gold, Hyatt Diamond, National EE
Posts: 1,003
I've had IT issues (imagine that) result in DL thinking I hadn't flown a segment when I had. I had no issues with connecting. When I called a week later to inquire about the miles not posting, the segment was still showing as unflown.
YMMV, and I wouldn't do this on purpose.