Chicago, Jan 8 : Chicago-based United Airlines (UA) has announced that it has temporarily grounded all of its Boeing 737 MAX 9 aircraft as required by the Federal Aviation Administration (FAA).

"United has temporarily suspended service on all Boeing 737 MAX 9 aircraft to conduct inspections required by the FAA. We are working with the FAA to clarify the inspection process and the requirements for returning all MAX 9 aircraft to service," the airline said in a statement released on Saturday.