Originally Posted by sadiqhassan

Even if it is one PNR, it could still be on different airlines. I wouldn't risk it either, though. But if the OP will otherwise throw away the ticket and buy a new one, it might be interesting to know.

For those who are interested (anecdotal, I know.)

I once had KHI-DXB-LHR EK and LHR-YYZ-YUL AC on one ticket. I no-showed for KHI-DXB but my LHR-YYZ-YUL segments stayed intact (and I could even complete OLCI for them). I didn't end up using any of the ticket and had it refunded, but it was an interesting anomoly nevertheless.

Something similar happened when I had a YYZ-LHR (AC) and VIE-JFK (OS) LGA-YYZ (AC) ticket - and I no-showed for VIE-JFK but LGA-YYZ stayed in tact.