The wreckage of an Asiana Airlines Boeing 777 is pictured after it crashed while landing at the San Francisco International Airport in San Francisco on Saturday, July 6, 2013. (AP Photo/Marcio Jose Sanchez)
** FILE ** A Southwest Airlines Boeing 737 waits to take off at Chicago's Midway International Airport as another lands on Feb. 10, 2012. (Associated Press)
An Air India Boeing 787 "Dreamliner" performs a demonstration flight during the first day of the 50th Paris Air Show at Le Bourget Airport, north of Paris, on Monday, June 17, 2013. (AP Photo/Francois Mori)
A British Airways Airbus A380 (right) takes off in front of an Air India Boeing 787 Dreamliner during the first day of the 50th Paris Air Show at Le Bourget Airport, north of Paris, on Monday, June 17, 2013. (AP Photo/Francois Mori)
An Ethiopian Airlines Boeing 787 Dreamliner prepares to depart from Addis Ababa Airport in Ethiopia on Saturday, April 27, 2013. (AP Photo/Elias Asmare)