Family of 737 max planes grounded until problem identified

Some countries have even banned the plane from flying over its airspace. The United States has also ordered the temporary grounding of all of its Boeing 737 MAX aircraft.

This has raised suspicions about a safety feature on the Max. Southwest is the world's largest operator of the 737 MAX 8 with 34 jets. American flies 24 MAX 8s and United flies 14 MAX 9s.