and part of the reason why airlines use ancillary charges is because they aren't taxed at the same rate as air fares and the ancillary revenues can't be attached to specific markets in competitor and government viewable databases.
The simple fact is that corporate customers are not using ULCCs, E. It doesn't take a rocket scientist to realize that, esp. from CVG, they don't fly to the same locations that business travelers go and they don't do it at the times that business customers need.
You are the one that is making the charge that corporate customers are fleeing to ULCCs. You need to provide evidence that is happening.
and you might also want to consider that, if your assertion is correct, then AA will be more affected than any other hub airline because AA at DFW has more ULCC competitive capacity than any other hub in the US.
You can't have it both ways. either ULCCs don't attract corporate passengers who have long been known to want the schedules and amenities that the legacies offer or none of that stuff matters and then ULCCs attract business passengers after all - and AA is most definitely affected.
what is absolutely clear and without dispute is that ULCCs carry double digit percentages of local passengers from DFW.
If you'd like to argue that a ULCC has been able to carry 1/5 of the local passengers that AA carries and those are real corporate passengers, then the addition of a major LCC hub will have a far larger impact on AA - esp. since it has already been demonstrated that WN carries as many if not more passengers from DAL compared to what AA carries from DFW in the markets where WN can currently fly nonstop to those markets from DAL.
In fact, I can't think of a single market that WN serves from DAL that WN doesn't have equal or nearly equal revenue and market share that AA has - and in a lot of cases, WN has a significant advantage.