Originally Posted by
mahasamatman
The major difference is when you can request the SDC. With PMCO, it was three hours before departure. With PMCO, it was 24 hours.
Minor correction.
PMUA is three hours before departure (not "was" either - that's still the rule). PMCO is 24 hours.
PMUA needs H class (or Y depending on the agent). PMCO needs the identical booking class that you are already booked into to make the change without change fees.
PMCO does allow SDC on international tickets. I believe PMUA does as well.
-RM