Originally Posted by Irish lad
...I have a HKG-SIN segment on the ticket. CX do that journey in first with a stop in BKK. If I get off the plane at BKK and never do the BKK-SIN part of that segment..
You will be better off getting the ticket reissued.
There are a few problems. You won't be able to check your bags to BKK and sometimes CX would check your boarding pass when BKK passengers deplane. You won't be allowed to get off with SIN boarding pass.
You should be able to get it rerouted by any OneWorld carrier at any office although it will be easier with BA who issued the original ticket. No need to go back to CAI for it.