Glad someone mentioned this; I had wondered about it too. FWIW, here's an observation that may be a useful piece of the puzzle...to someone sharper than I:

I often get lots of codeshare options to come up *on CO.com* when searching by "best price". IIRC, these have included itineraries that were all codeshare. But then trying to (opportunistically maximize my miles by taking that info and moving to) search by "schedule" returns only the CO metal flights out of all those previously shown at the low fares. Hm.

[This message has been edited by chai (edited 01-15-2002).]