If they zero out J from DFW, they can go J7 in dozens more connecting markets. They know they'll fill up and probably over sell in Y from their hub, so it makes sense to use J to offer premium priced seats (vs deep discounted Y) in other markets if they can sell them.
Use the J seats/service to sell at a premium where a connection is required and where aa faces more competition, which would otherwise push down prices. Very logical (really).
Originally Posted by
shd9
Also noticed that. Many times flight from DFW are J0 while the exact same flight, if booked as a connection have some seats available. I can’t really understand the logic here because ex-DFW tickets are usually very pricey compared to other ports, and while they may want to limit ticket sales from a city, holding off full J isn’t really making sense.