American Airlines is running a hot summer promotion for frequent visitors to their website. Basically, customers are invited to test their knowledge of American' Airlines' e-mail products and win prizes. Five grand prize winners will each receive coach seating on a flight and hotel accommodations for two at Harrah's San Diego, along with a chance to participate in the Harrah's Casino's Total Rewards "3 Million on the House" event this September. Grand prizes in the Harrah's event include $1 million dollars, one million AAdvantage miles, and one million Reward Credits. Ante up and click to the website to enter.