WASHINGTON, June 18 (Xinhua) -- Boeing CEO Dave Calhoun was grilled by U.S. lawmakers in a Senate hearing on Tuesday over the air giant's growing safety and quality control crises.
"It's not enough for Boeing to shrug its shoulders and say, well, mistakes happen," Democratic Senator Richard Blumenthal, chair of a Senate subcommittee on investigations, said in his opening remarks.
"This is not an industry
