As reported by engadget,
American Airlines is gearing up to become the first US airline to resume commercial passenger flights with the Boeing 737 Max after the plane’s 20-month ban was lifted. The company has completed a test flight with media onboard — a short 45-minute trip from Dallas, Texas to Tulsa, Oklahoma — as part of a public relations campaign before it resumes commercial flights on December 29th. Boeing’s 737 Max planes were grounded around the world in March 2019 following two fatal crashes within a span of five months.
Investigators determined that Lion Air flight 610 and Ethiopian Airlines flight 302 crashed due to, among a few factors, a sensor that sent wrong information to the flight control system. Boeing had to rewrite the plane’s software, update its manuals and conduct key flight safety tests before the FAA cleared the 737 Max’s return to service.