Boeing CEO testifies, US retail sales data: What to watch Yahoo FinanceBoeing hid questionable parts from regulators that may have been installed in 737 Max planes, new whistleblower alleges CNNNew Boeing whistleblower comes forward hours before CEO’s Senate testimony The HillBefore Boeing CEO hearing, Senate releases new claims of 737 MAX fraud The Seattle TimesBoeing CEO heads for Senate grilling as new whistleblower alleges company hid bad airplane parts CNBC