The December schedule is showing some flights pulled from off-peak days during the predictably slow perdiod between Thanksgiving and Christmas. Most these are late-PM flights on Tuesday/Wendnesdays. In the case of MKE-LAS they are running an additional Thursday flight to add capacity to peak days.

January doesn't show any such adjustments yet, although I wouldn't be surprised. If there are to be long-anticipated cutbacks in the FL/WN Milwaukee east-west operation, they seem unlikely to come until March or later. As such, this winter will have as much overcapacity as last winter, when both FL and F9 averaged half-empty planes. And so it would not surprise me to see these sorts of off-peak flight reductions pushed into January. But we shall see.