What Is the Boeing 737 Max and Which Airlines Fly It?

First flown in 1967, Boeing Co.’s 737 has become the world’s best-selling commercial aircraft. The fourth generation of 737s -- known as the 737 Max -- made its debut in 2017 when Indonesian discount carrier Lion Air became the first commercial operator. Yet two fatal crashes within five months -- Lion Air flight 610 in October off the coast of Indonesia and Ethiopian Airlines flight 302 in March outside Addis Ababa -- have put the 737’s previously sound safety record under the microscope.