Question on Airtran Credits : Extending the expiration date?

[PPLA]

I have x2 0.5 Airtran one expires on June 7th 2013 and another in July 2013.

I am one point away from a buisness class upgrade.

Is there anyway to extend the life of these credits?

if it helps I have a SWA account as well.

Thanks in Advance!

[mochada]

You can always transfer SW points to Airtran to get the extra points...but a) depending on where you are travelling, you can buy up to an upgrade and b) if you have a corp acct you have the possibility of an upgrade.
I have had lots of luck with upgrades using my corp acct.

Is it possible to extend the credits? I believe it is $29/credit.