No, this is not a duplicate. Yes, I've already seen this question.
Consider a scenario where I book a round-trip ticket and the return flight is cancelled.
My questions are the following:
(a) Which of the following options would a typical US airline be required to provide me with?
Refund my entire ticket and otherwise leave me "stranded".
Refund only a portion of my ticket (and otherwise leave me "stranded").
Provide me with alternate transportation back home at no extra cost.
(any other options not listed?)
(b) Would the answer to the above be any different for a case where the return portion consists of multiple connecting flights, and one of the flights other than the first is cancelled?
(i.e., if I've already embarked on the return journey, is that different from not having yet done so?)
(c) Would the answer be different if I was combining one-way tickets in lieu of a round-trip ticket?
(i.e., do round-trip tickets have an advantage in the case where part of the return leg is cancelled?)