So I don't think this has been answered (after searching "fare class availability").

I am trying to go from the east coast to the west coast on December 30/31. One-way. I know that my flight isn't going to be cheap but I'd like it to not be ridiculously expensive either. I'm using flight stats to look at fare code availability to see what my best bets are. Delta.com is not shooting out the same available fare codes though..

For instance: AAA-BBB-CCC. On the AAA-BBB route there is V fare availability (V through Y). On the BBB-CCC route there is U fare availability. When I try to book this flight on Delta, it sends me to H fare. When I try to only book AAA-BBB it sends me to T fare. When I try to only book BBB-CCC, it sends me to a K fare. When I try to book AAA-BBB-CCC as a one-way (not multi-city) trip, I get thrown into a K fare, as well.

Is there any way to book this trip with a U fare price (since I know it's available)? I'm sure this has to do with married segments but I'm at a loss.