A United Airlines plane bound for Guam on Sunday returned to Chubu airport in Aichi Prefecture for an emergency landing after detecting a system malfunction during the flight, the transport ministry said. Flight 136, a Boeing 737 aircraft, made the return landing at around 11:40 a.m. There were no injuries among the 44 passengers and six crew members on board, according to the ministry. The flight was canceled, and the runway at Chubu airport was temporarily closed, the ministry said, adding that no damage to the aircraft had been confirmed.