Question: how many aadvantage miles to upgrade to business class?
Answer: A 500-mile upgrade costs $40, but it can only be purchased by an AAdvantage frequent flier program elite member. Elite members may also use miles to purchase 500-miles upgrades at the rate of 8 upgrades for 40,000 AAdvantage miles. Upgrades can also be earned by Platinum and Gold level AAdvantage elite members.