After two deadly crashes in March 2019, the Boeing’s 737 Max was grounded. But not anymore. American Airlines was the first to fly the plane commercially in almost two years. The first flight was from Miami to New York. The carrier will take one round-trip daily between the two airports before increasing service to other cities. The Max is Boeing’s bestselling model. More than 3,000 of them are on order around the world. The Federal Aviation Administration cleared the plane to fly in November. Safety changes included a less-aggressive flight-control system, more redundancy, and more pilot training with a flight simulator.