Welcome to FT DuncanJay! There's a great thread on AA challenges - the caveat now is that you have to pay for the challenge ($150 for the Platinum Challenge). Basically you have to fly 10,000 EQPs within 90 days and you obtain platinum status. Here is the link to that thread - feel free to ask any questions that you may have after you've read the thread.

http://www.flyertalk.com/forum/ameri...nges-more.html