American Airlines parent AMR Corp. lost $97 million in the last three months of 2010 and $471 million for the full year

, an improvement from 2009's fourth-quarter and full-year loss of $344 million and $1.5 billion, respectively. Citing "a recovering economy and a significantly improved fare environment, as well as a business travel market that has regained strength," American reported year-over-year mainline passenger revenue per available seat mile increased 7 percent in the fourth quarter. American's fourth-quarter yield, an indicator of average fare, grew by 6.5 percent from the fourth quarter of 2009.