I'm booked into O (from W bought as a DL W fare but rebooked to AF W to upgrade) on SAN-ATL-YUL-CDG-LHR later this week. Today, LAX-CDG-LHR opened up in O, so I called to see about changing in exchange for £100. Agent could see the O, but AF is showing W0 S0 A0 for the LAX-CDG flight, so AF refused to allow the change. It was after 2100 PDT by the time I was able to call, so I didn't push too hard for the agent to see if someone would authorize overbooking W for 30 seconds in order to get me the O seat. Anyone have experience with this sort of thing? I'm going to ring up first thing in the morning here on the west coast in hopes that I can get someone to call Paris and get a manual override authorized, but any advice would be much appreciated.