** FILE ** This June 29, 2011, file photo, shows an American Airlines aircraft at Terminal D at Dallas-Fort Worth International Airport, in Grapevine, Texas. (AP Photo/Tony Gutierrez, File)

Photo by: Tony Gutierrez

** FILE ** This June 29, 2011, file photo, shows an American Airlines aircraft at Terminal D at Dallas-Fort Worth International Airport, in Grapevine, Texas. (AP Photo/Tony Gutierrez, File)