You can earn 100 free American Airlines AAdvantange points by joining AAdvantage’s Summer Miles Challenge via Facebook. Taking the challenge also qualifies you to be entered to win 100,000 miles! For every registration, American Arilines will make a donation to Miles for Kids in Need, which provides international support to improve the standard of living and quality of life for children & families with medical, educational, and social service needs. One mile will also be donated per share via Facebook or Twitter.