IAH-MAD won't have the high-yield O&D business traffic that MIA-MAD and NYC-MAD have, but I think that there are enough conncetion possibilites that IAH-MAD could work out with a 764. AA used to have DFW-MAD service, but moved it to MIA to take advantage of MIA's O&D base and better Latin American connections. MAD is one of AA's biggest cash cows.