However, other news is not-so-positive. For example, the City of Los Angeles is suing American Airlines for $21.5 million, alleging that the airline has underpaid the airport since December 2010. In 2006, LAX adopted a calculation that increased costs for maintenance and operating fees for airlines that operate out of LAX. The airport reached long-term agreements with all airlines except American in 2012, and the airline continued paying a lower fee from a prior interim agreement. The parent company of American Airlines filed for bankruptcy on Nov. 29, 2011.