finally CA/MU have got the gov't's nodding on joining alliance.
the most likely scenario is they will each join *A/OW, but it is also likely that they both join OW, as they both are in good relationship with CX (MU is a partner of asiamile already).

(in such case CZ will join *A.)

however, the main obstacle for joining OW is the IT requirements and the related costs, it may take at aleast a couple years....