American Airlines has launched a review of its global advertising and media accounts. The carrier, with AAR helping in the review, hopes to make a decision by the end of the year. The airline has worked with McCann Worldgroup agencies for more than 20 years. In the U.S. American Airlines works with McCann Erickson and sibling Dallas-based TM. Universal McCann handles American Airline’s media account outside the U.S. In the UK, Universal McCann Manchester has the business.