Boeing's chief executive Dave Calhoun will testify before US lawmakers, acknowledging the company's imperfect safety culture. Whistleblowers raised concerns about production issues with 737 Max, 787 Dreamliner, and 777 models. Boeing has faced criticism following incidents like a door falling off a 737 Max in flight. Calhoun will apologize to families affected by past tragedies and express commitment to safety. The company has faced scrutiny since 737 Max crashes in 2018 and 2019, leading to grounding and ongoing legal challenges. Boeing is working to repair its safety culture and improve quality control, with plans to enhance aircraft quality. Calhoun stresses the importance of getting it right every time in the aviation industry. Families of victims are demanding justice and accountability from Boeing. The company is cooperating with authorities and addressing issues internally to ensure safety improvements.