If you have the Citi AAdvantage Business World Elite Mastercard, you can claim an easy 25,000 AAdvantage miles. American Airlines is offering a 25,000-mile bonus for joining AAdvantage Business and entering promo code JOINA7. Normally, businesses must have at least five active travelers and spend $5,000 per calendar year to qualify, but those requirements are waived for Citi AAdvantage Business cardholders. Even existing cardholders can claim the bonus. Go here, log in to your AAdvantage Business account, go to Settings, enter JOINA7 in the Promo Code field, save your changes, and the bonus should post shortly after refreshing your account.