Three senior Boeing executives including its CEO are stepping down, the company said Monday, as the company continues to deal with an ongoing scandal surrounding the safety of its passenger jets.CEO Dave Calhoun confirmed he was leaving the company in a statement. Stan Deal, the CEO and president of Boeing Commercial Airplanes, has retired effective immediately. Larry Kellner, chair of the company’s board of directors, will not stand for re-election at the next shareholders’ annual meeting. Boeing board member and former Qualcomm CEO Steve Mollenkopf will succeed Kellner.”President and CEO…