no need to repurchase, really. the airline should have assigned your parents to the next flight when available (each flight has a couple of reserved seats for situations like this). all you need to pay is the extra cost for lodging during the wait. hopefully the newly purchased ticket is not for round-trip, otherwise you may have to go through the refund/credit troubles.
【在 F***Q 的大作中提到】 : : no need to repurchase, really. the airline should have assigned your parents : to the next flight when available (each flight has a couple of reserved : seats for situations like this). all you need to pay is the extra cost for : lodging during the wait. : hopefully the newly purchased ticket is not for round-trip, otherwise you : may have to go through the refund/credit troubles.