EDIT as of 0830GMT 25DEC18: Pakistan International is maintaining service to Tokyo Narita. Reservation for flight departing on 31JAN19 (Pakistan departure) is not available, however flights on/after 04FEB19 remains open booking, currently until 28FEB19 inclusive. Additional changes likely.
Previously, Airlineroute reported reservation on/after 31JAN19 is closed, this is no longer correct. The airline operates 2 weekly Islamabad – Beijing – Tokyo Narita routing, with 777-200ER.
PK852 ISB2325 – 0725+1PEK0850+1 – 1305+1NRT 772 47
PK853 NRT1435 – 1705PEK1835 – 2205ISB 772 15
Original information on this post has been edited, and related info on twitter also removed.