"The world needs a healthy, safe, and successful Boeing. And that is what it is going to get." Boeing's dizzying fall from grace following a near-catastrophe in January on air-bound 737 Max 9 plane exposed the damage from a gradual cultural shift over a quarter-century that put more focus on financial returns than production methods. Whoever takes over from Calhoun, who's said he's staying until the end of the year at the latest, will need to reboot the company's safety culture, fix relations with frustrated airlines and rebuild market share that's been slipping in favor of Airbus. Given the enormity of the challenges, Boeing can't afford to grant its next leader a long learning curve. But the underlying businesses aren't easy for outsiders to master, being a blend of highly complex engineering, high-volume manufacturing and machines built to the highest safety standard, said Richard Aboulafia, a consultant and longtime aviation analyst.