Originally Posted by
cooger72
http://www.aplusrewards.com/a_terms_...sClassUpgrades
Getting Free Business Class Upgrades: Call us at 1-888-3-A-PLUS-8 (1-888-327-5878) to reserve your upgrade to Business Class anytime beginning m
idnight the day prior to departure. Four (4) A+ Rewards credits are required to redeem for a one-way Business Class upgrade.
Exactly right for non-Elites. For Elites the window opens at T-48 hours. I have done this on multiple occasions, though sometimes I have to remind the agent of this Elite benefit. Here's a link:
http://www.airtran.com/eliteupgrades/
Note, in particular, the last FAQ on the page.