According to Japanese media reports, on the morning of the 4th, a Boeing 777 cargo plane belonging to Polar Cargo Airlines of the United States urgently returned to Narita Airport due to engine failure shortly after takeoff. According to reports from the Japanese Ministry of Land, Infrastructure, Transport and Narita Airport, the Boeing 777 cargo plane took off from Narita Airport in Japan and headed to Los Angeles, USA. A few minutes after takeoff, it was discovered that the right engine had malfunctioned, and fuel was discarded at sea. It urgently landed at Narita Airport more than an hour after takeoff.