They are worth a free one way ticket to anywhere Airtran flies IF you each either buy two additional credits at $29 a piece; or find some kind AirTran elite to transfer two of their to each of you ( a free transfer for the Elite, but he has to have some expiring credits to transfer ).

As long as you BOOK the one way before the expiration date, the ticket itself can have a travel date that is well into the future. Airtran does not book 11 months into the future like most of the legacy carriers. They will book between 7-9 months into the future.