Maybe NW will test this in MEM with the possiblity of rolling it out to DTW and MSP. AA, if I remember correctly, planned that they could operate the same number of fligts at ORD with a few fewer aircraft. As mentioned before the connection times may be increased, but how much fun is it to sit at #20 for departure in DTW for a 20 minute flight to LAN/FNT, etc. I believe the previous thread mentions the gap times in MEM. When coming in from the west coast (always early) the place is a f'ing goast town! But I believe that MSP and DTW have too many flight banks to realize any benefit from the "rolling hub" concept.