United Airlines employees learn about performing ground checks on flight a Boeing 787 Dreamliner aircraft from Houston, Texas, after it landed at Chicago's O'Hare International Airport Monday, May 20, 2013. The planes are returning after being grounded for four months by the federal government because of smoldering batteries on 787s owned by other airlines. (AP Photo/Charles Rex Arbogast)

Associated Press
United Airlines employees learn about performing ground checks on flight a Boeing 787 Dreamliner aircraft from Houston, Texas, after it landed at Chicago's O'Hare International Airport Monday, May 20, 2013.  The planes are returning after being grounded for four months by the federal government because of smoldering batteries on 787s owned by other airlines. (AP Photo/Charles Rex Arbogast)
United Airlines employees learn about performing ground checks on flight a Boeing 787 Dreamliner aircraft from Houston, Texas, after it landed at Chicago's O'Hare International Airport Monday, May 20, 2013. The planes are returning after being grounded for four months by the federal government because of smoldering batteries on 787s owned by other airlines. (AP Photo/Charles Rex Arbogast)
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