I have taken the Monterey-LAX AE codeshare many times, and it usually posts quicker than my NW flights do. Good luck trying to get it credited, most people at CO and OP don't even know this code-share exists. Just trying to make these reservations, I sometimes have to insist "YES, you do have such a flight!" Even harder still when I did a DTW-CLE on NW, then CLE to LAX on CO, then LAX-MRY on AE and my luggage didn't show up... Try resolving that!