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
My understanding is that it's really one flight in 24 months. I remember rules saying that the third year is only available to resolve missing credit from the first two years, not for crediting new flights taken during the third year.