Originally Posted by
MaxBuck
If the ticket is refundable, you're obligated to give them the return ticket for refund IMO.
But even a refundable ticket (even YY) will not be 50% + 50%, getting back half if you don't fly. Depending on what sort of refundable ticket it is, it may be 70% +30%, where you may get back 20% if you don't fly the return leg.