Well you are not getting the "! There are no First/BusinessFirst/International Business Class seats available on CO*** in the Austin, TX (AUS) to Atlanta, GA (ATL) market." so I would assume you are fine. I would call co.com support and explain the problem first before you book as it looks like the tickets are non-refundable. One thing that concerns me is that co.com does not list an R fare for a Continental Airlines (CO) flight number on ticket for Delta Air Lines-operated flights.