My first thoughts were that you'd be out of luck.
However, the forthcoming merger of AA and US may help? I'm not too sure of the timings of the merger but I'm assuming US would become a OW partner by Aug? Maybe this would be of use.
EDIT - US Air operates IAD - MIA (Via CLT)
Last edited by vibrex; Dec 21, 2013 at 1:39 pm