This matches my experience too - about once a year I get CX ATO to reissue a AONE3 from AA stock (from Cairo previously), arriving about 3 hours before the flight I am next to take (and for which the reroute is needed). It has never been a major problem (although it gets reissued as CX stock), and if it's going to take more than half an hour or so I normally end up awaiting my new ticket in The Wing. On one occasion where my next two flights were to somewhere (NRT?) and back on CX I was given boarding passes for those flights, a message was sent to NRT to make sure there would be no problem there, and I picked up the reissued ticket when I returned to HKG.

It's Service (with a capital S) - and it's a great shame that CX now seems to be going down the road of disaggregating all their charges so that we get ncikel 'n' dimed every time they lift a finger. If I'm paying several thousand US$ for a ticket I don't want the hassle of being charged for a few minutes of someone's time to enable me to use that ticket within the terms of the contract I originally accepted. It's not the amount that's the issue, it's the pettiness of it, which does CX's image as a Premium Service Provider no good at all.