Boeing CEO David Calhoun is set to testify before Congress as lawmakers investigate quality oversight and production failures at the aircraft manufacturer. Multiple investigations and whistleblower complaints have been linked to a midair door panel blowout on an Alaska Airlines flight in January, renewing safety concerns after the 737 Max crashes that killed 346 people. The Justice Department has launched a criminal investigation into the door panel incident, and Boeing faces a decision on potential fraud prosecution related to a previous deal. Calhoun apologized for the crashes in his testimony and outlined steps Boeing is taking to prevent future incidents. The company is under scrutiny for alleged quality lapses and retaliation against whistleblowers. Boeing is working to address identified quality shortfalls but faces challenges in changing its safety culture. The industry continues to face scrutiny over manufacturing issues, with ongoing investigations into falsified documentation and incorrect installations on Boeing aircraft.