Frontier Airlines EarlyReturns - Summit Airtran Upgrade?

Do Summit (or Ascent) members get complimentary business class upgrades on AirTran?

I see that a+ elite members get Summit benefits.

According to Frontier's website, no.

From: http://www.frontierairlines.com/frontier/faqs/airtran-faqs.do

I am a Frontier EarlyReturns® Ascent/Summit member. What benefits do I receive when flying AirTran Airways ?

As your Ascent/Summit status carries over to AirTran Airways, presentation of your Frontier EarlyReturns® Ascent/Summit card entitles you to dedicated check-in positions, priority at security checkpoints and priority boarding. At this time, upgrades to Business Class are not an Ascent/Summit member benefit when flying on AirTran Airways Airways.

I did receive a complimentary Business upgrade as a Summit flying on Airtran several years back, but it was just after the partnership announcement, and I don't think anyone really knew if it was a benefit or not. I asked the Airtran GA, showed him my card, and he took a pen and scratched a new seat assignment on my BP, without entering anything into the computer.

So, you might consider asking, but it would be entirely based on luck and Airtran not putting procedures in place to prevent this.