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
Even very minor schedule changes (change of time by a minute or two or just a change of flight number or aircraft type without changing the schedule at all) can result in the seat you picked being changed or lost competely, so you need to watch for that too.