Originally Posted by
serfty
As posted if MX was not in oneworld when the ticket was issued, then MX segments should be be able to be included now.
No they shouldn't. The rules are those in force at the time of original ticket issuance. Since MX would not have been listed as a valid carrier then, it still would not be now
Whether rules change for the better or worse, the ones that count are those at time of purchase
Dave