MIAMI – The Ministry of Land, Infrastructure, Transport and Tourism of Japan has grounded domestic airlines from operating flights using Boeing 777s fitted with PW4000 engines. The decision follows a Japan Airlines (JL) Boeing 777 with starboard engine trouble making an emergency landing at Okinawa International Airport (OKA) in December and the recent United Airlines (UA) Boeing 777 emergency landing this weekend. NOTAM’s relaying the restrictions state that all Boeing 777s fitted with PW4000 engines are requested to avoid Japanese airspace until further notice. ANA Boeing 777-200 at Haneda International Airport | Photo: Kochan Kleps Domestic Boeing 777 Aircraft Domestic aircraft affected by the grounding are 19 All Nippon Airways (NH) Boeing 777s and 13 JL Boeing 777s. The airlines grounded the aircraft on their own on Sunday following the UA incident.