Does AWA have only A320s, or A319/320/321? And, what type of engines -- CFM or IAE? U has the CFM.
Also, do the AWA 757s have Pratt or Rolls Royce engines? U has the Rolls.
I don't know much about the 737 (even though I'm typed), but are there engine differences which might be an issue?
If the engines are incompatible, does anyone know if the FAA will allow each fleet to be operated as a single qualification?