Sorry if this question has been asked before...
I have six upcoming flights on CO, and would like to see seat availability in First to get an idea of upgrade chances. Given that 4 of 6 flights are in class N or higher, I fancy my chances. However, is there any software/website I can use to determine seat availability? For instance, I remember seeing something like "A7 J7 R7" in a different thread, but can't find the tools that do that. I checked ITAsoftware.com and ITN.net, even registered at the latter, but couldn't figure out how to determine seat availability based on fare class. I understand CO uses "X" class for upgradable seats while NW uses "R" class for the same.

Thanks in advance.

P.S I'm posting in the CO Forum since all flights are on CO metal - being Silver, almost at Gold, I don't fly anyone else..!