Originally Posted by
ecfc29
Not sure why A C and C are relevant in answering the question?
The airline in question does not fly from B to C, so it is with a partner airline. But the ticket is essentially from A - B outbound and B - A - C inbound with the carrier operating A - B and B - A and B - C is operated by another carrier. But its one ticket.
Details can help with nuances in particular circumstances/airlines that may affect your decision. The airline isn't going to find you out and hunt you down based on a Flyertalk posting!
Just because a partner carrier is operating the last leg doesn't necessarily preclude a rerouting due to IRROPS. It's possible a cancelation on the "B to A' return segment could result in you rerouted via that same partner - or even a different partner airline - instead, and not touching "A" at all. It's probably not a huge chance in most cases may still be possible. Knowing what airlines and routes involved might provide a better guesstimate of the risk of that occurring.