Boeing 737 MAX makes emergency landing during US transfer: FAA
https://phys.org/news/2019-03-boeing-max-emergency-faa.html
"The FAA is investigating," added the agency, which grounded the Boeing 737 MAX on March 13 following two deadly accidents involving Ethiopian Airlines and Lion Air but continues to allow the planes to be ferried from airport to airport.
Southwest said the plane experienced an engine problem "shortly after takeoff."