Originally Posted by
Flyer737
Here is a possible way. Use your voucher to book a refundable ticket for a little lower value than the ticket you really want (lots of cheap refundable fares on SWA routes in Texas/other places). After a few days, change it to what you really want and pay the difference via your PPE card.
I am not sure credit from non-refundable ticket can be used to book refundable fares?