US regulators announced extra inspections on Boeing Co 777 jets using the same type of engine that shed debris over Denver on Saturday, while Japan went further and suspended their use while it considers what action to take.
The regulatory moves involving Pratt & Whitney 4000 engines came after a United Airlines 777 landed safely at Denver International Airport on Saturday after its right engine failed.
United said on Sunday it would voluntarily and temporarily remove its 24 active planes of the type from its schedule.