Originally Posted by
christep
In my experience MPC can reissue to a higher class up until the flight is released to the airport (i.e. up to about 3 or 4 hours before the flight).
Actually, CX handsover the flight to SYD CX office a night before. Last time I tried to rebook my flight to CX 110 (departs 7:30am from SYD) the night before, and MPC said that I could only try at the check in counter in SYD, as they had already handover the flight to SYD airport. (and obviously, I could not ring SYD office, as it was not in office hour). So, that's right, "3 or 4 hours before the flight" only applies to certain airports.