It appears that NW WorldPerks has an 'auto-upgrade' feature for their elite Worldperks members (but not CO elites flying on NW)

see: http://www.flyertalk.com/forum/Forum35/HTML/000009.html

Does, Continental provide an auto upgrade feature for elites when flying on CO flights? If yes, do they then do this 'auto upgrade' feature for NW elites?

(by the way, I have never been autoupgraded on CO....)