My better half works in yield management for NW. The analyst for the DFW market is one of the tightest in the company. Good for revenue, bad for commuters. DFW is probibly one of the most difficult commutes from MSP, DTW and MEM on NW for that reason (I've done MSP-DFW...it isn't fun). AA on the other hand tends to have a few seats on every flight but heavy travel periods will probibly require a two-leg commute.