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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
OPUPs occur when coach is oversold but there are empty seats in D1/FC.
If the flight is practically empty in coach, it won't happen. Being practically empty in business class simply means that there are empty seats available if coach is overbooked.