Bonus Code: CHHEL Dates: Travel between May 1, 2011, through July 31, 2011. Offer: Beginning May 1, 2011, American Airlines will offer daily nonstop seasonal service from Chicago O'Hare to Helsinki, Finland. EARN UP TO 15,000 AADVANTAGE® BONUS MILES. To celebrate the new flight, we are offering AAdvantage bonus miles. And, this bonus is unlimited, so you can earn it each time you travel during the promotional period. See the chart below for details: Business Class: 15,000 bonus miles Fares Full-Fare Economy Class (fares booked in Y or B): 10,000 bonus miles Discount Economy Class: 5,000 bonus miles Link to aa.com.