Originally Posted by
D582
The previous set of these fares were dual-inventory fares that booked into B but required inventory in a lower booking class as well. BLTFFKLT likely required K and BLTFFTLT likely required T. The new versions of these fares are single inventory booking directly into the lower RBD (i.e. K and T directly). All of these fares are fare-by-rule based on another lower fare with an upcharge applied. When changing these after departure, it will use fares in effect at time of ticketing, but since they are dual inventory fares, you need the same lower fare class available to keep the same fare (notwithstanding other things such as day of week etc). So an ad-col may be because you need to move to a higher fare.
Thanks. The search engine is giving me zero flights on any dates I search, which suggests at least the website/app issue is not a matter of K or T availability.
Re the ad-col, I wonder if what's happening is that when I try to change the flight through an agent, somehow the existing fare is being treated for pricing as if it's a T, rather than a B that depends on T inventory. The agent sees B on her end, but I get charged the difference between B and T not because there is no T availability (there is in expert flyer), but because the system treats it as a T fare and applies the upcharge. Is this a possibility?