The head of the Federal Aviation Administration told a U.S. House subcommittee Tuesday that safety culture improvements at Boeing may take three to five years to complete. "It is not a six-month program -- it is a three-year to five-year program,

Boeing (NYSE:BA) has to make “significant changes” to improve the quality and safety of its airplanes, the head of the U.S. Federal Aviation Administration said in prepared remarks on Tuesday. Speaking at the latest congressional hearing on the agency’s oversight of Boeing (BA),