e3fc0434_anced_seat_selection___Gadling__Premium_Services
[0] Airtran [Earliest available] During booking, before purchase [Charge?] $6-$20 [Can you pre book an exit row?] $20, book anytime [Premium Services] 
Upgrades to business class available at set prices
Once a free perk, many airlines now charge for advanced seat selection - Gadling
Premium Services