Originally Posted by
ernestnywang
Changing the BA sector to an earlier one on a BA-CX connection is not a problem, as long as the connection remains within 24 hours. I don't think changing a BA-CX connection to BA-BA is a change (if these are the only sectors on the ticket), as the combination of airlines change (CX is dropped), but a cancellation. Also, it would require the original BA sector to be cancelled and rebooked to satisfy Married Segment Control (MSC) requirement.
You’re right on both counts
I completely forgot what I wrote on Reddit about cancellation and reissues this week
https://www.reddit.com/r/CathayPacific/s/nJxc3TU58E
i corrected my post #2
Although just IMO - MSC doesn't seem to be such a big thing with BA. I was able to change a HKG-LHR-AGP-LHR-HKG to HKG-LHR-GIB//AGP-LHR-HKG in Nov 2023
https://www.flyertalk.com/forum/35804715-post2.html and
https://www.flyertalk.com/forum/35804715-post2.html (oh. re-reading my old post there was some pushback. But ultimately it can be done).