Several months ago, I forgot my claim that I would never use skyauction again, and started looking at european fares listed with NW/KLM as the carrier. Then, the specific carrier disappeared, replaced by the "Major Intl Carrier", although all the serviced airports and zone classifications still remined the same. Sure sounded like NW, but I wanted to be sure, so I e-mailed skyauction. Answer: once you confirm (pay for) an auction, THEN you will be told the carrier.
About a year ago they did this with CO designated flights, then changed to the anonymous carrier but with the same CO hubs and serviced cities as before.
So the bottom line is you can make a pretty good guess on the carrier by looking at the cities/hubs, but no guarantee.
Good luck
[This message has been edited by tartetatin (edited 10-09-2000).]