Just doing a +1 , +2 or whatever. Delta has frequently not processed my CC's for international travel without me first getting my CC to approve it, especially with Capital One. Annoying as can be. It will tell me that it wasn't authorized, but my CC is really just holding it in suspension of some sort until I approve or disapprove it. On the bright side, this can be potentially helpful if you think you want the flight, but aren't 100% sure as it appears to "kinda" book it at that price until you verify the info.