I have some A+ credits + business class upgrades so I'd like to use Airtran to book my flights however my desired flights (5/23-5/26 ATL-TPA) are unavailable on Airtran.com yet wide open on Southwest.com. What's the deal with that? Doe those ever reappear on Airtran or should I just covert them over to points and disregard the business class upgrades?