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: 102,617
In the 5 pm ATL time era, upgrades that didn't clear at the DM window would often clear a couple days later in the middle of the night. I don't know whether it was a case of inventory opening at that time or not, but DL seemed to regularly run a sweep at about 3-4 am ATL time.