Originally Posted by
mfhstid
I don't find it terribly reliable. Some of the CO availability is restricted to Onepass members, while data for other carriers is on occasion incorrect. Where it is useful, however, is in allowing you to identify potential availability over long periods of time, which can then be confirmed on ANA.
The calendar approach at CO.com is useful.
What I've noticed with CO is that they have "married pair" redemptions only for OnePass members: BOS-IAH-LAX will show up as available, but individually BOS-IAH and IAH-LAX will not. *A will not be able to book the trip if the individual sectors are not available. However, if you are able to find a seat on a non-stop flight at CO.com, then IME you will be able to book it via *A.
Also, ANA and Aeroplan include more airlines than CO.com, and CO.com includes some partner airlines (like Copa) that you can't currently book via *A. That said, that calendar search is very useful!