I am trying to figure out some travel later this year. I’m not sure if I will want to fly to JFK or BOS from the international origin point in question. Can I book two tickets XXX-JFK and XXX-BOS (Blue fare so it’s refundable) and then refund the one I don’t want to use closer to the travel date?

or will they be auto-cancelled since they “clash”? Technically speaking the flights would just be on the same day and will not actually clash in terms of timing