On March 8, 2020 I emailed customer service on this exact issue. I had two flights booked for March and April with funds from a voucher that expires May 6, 2020. Obviously I cancelled both flights. Funds are available for future use BEFORE May 6, 2020. SWA responded to my request to extend the expiration date saying they are NOT able to honor my request. Hopefully this will change in the days to come given the current situation.
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