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: 100,417
A major advantage of trying to upgrade KLM marketed and KLM operated segments is that you can see business class upgrade inventory on EF. This includes the ability to search a range of dates at once and to save such searches for later use. It's very slick and EF even reminds you of the correct inventory you want.
For DL segments, we must call DL and be at the mercy of phone agents who might be experts at this and know exactly what to do or might be clueless but adamant.