Incorrect. If they cancel your flight before you leave home, say three months in advance, literally ALL they have to do is give you your money back. If they cancel your return flight after you have left home, yes, they have to get you back home. But if they cancel your flight, they will attempt to re-book you on something you can live with, but they have no obligation to get you there if they cancel the flight all together, some time in advance. They want to keep you as a customer, so they will try to do something for you, but they don't have to. Not at all.