A few days ago I received a written response from the NWA Sr Honcho I noted in my 10/27/99 posting above, reiterating that in early 1999 NWA had liberalized upgrade access to Europeean flights, but they found much greater usage than anticipated. The result had been a loss of revenue caused by WBC seats not being available to those willing to pay the $5M+ fare - not a good thing for a for profit business.
I'll keep FTers informed of anything else I learn.