Expedia is probably the easiest. Go to "Flights", then to "Lowest Fares". Select your flights and also specify that you want AC. (If you don't you'll get a list from several different airlines and not be able to access all of AC's fares). You will then get a listing of all the published fares and a notation of the booking class at the top of each one.

You can do more or less the same with Travelocity, but use "My dates are flexible". The prices will show, but you'll need to click on "rules" to get the booking code and all the restrictions

Hope that helps.

[This message has been edited by Academic (edited 07-24-2001).]