Originally Posted by
anabolism
No. I tried but BA says that it is disallowed on RTWs.
Wow, BA disallowed ?
CX/Asiamiles permits upgrade from business to First of CX flights of DONEX.
However, if a ticket is not issued by CX, practically very hard to sort out e-ticketing issue of award booking/ticket and original booking.
Recently I have read a thread about AA-RTW desk's handling of CX's upgrade reservation about this.
Edit:
Asismiles permit roundtrip upgrade from D class to First on BA and AA but not for oneway.
This is a tricky part for upgrade of RTW.
I have no real experience, but theoretically, Asiamiles permit upgrade for AA/BA's roundtrip flights within a RTW.