Get 30,000 bonus miles when you sign up for the Citi Business AAdvantage Mastercard and spend $1000 in 3 months. You'll also earn 2 miles on every American Airlines purchase, as well as on certain office supply, telecommunication, and car rental merchants. Other perks include a free checked bag for you and up to 4 companions, priority boarding, 25% off select in-flight purchases, and a 5% miles bonus every year you renew your card. The $99 annual fee is waived the first year. Note: Business cards can be used by individuals, like sole proprietors, which you are if you merely sell things on eBay, or members of an LLC . Simply select "sole proprietor" for "type of business" and then enter your name as the legal name and social security number as the Tax ID number.