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
T-30 is the check in cutoff, so in principle someone could purchase a ticket or SDC until T-30. You can be upgraded even later than this if someone is a no show or misses the flight for whatever reason, including IROPs leading to a delayed connection or overstaying in a SC or airport bar, etc.