There is plenty of first class award space on Japan Airlines for New York JFK – Tokyo and Chicago – Tokyo over the next 6 weeks. There’s also a new pattern for American’s Dallas and Los Angeles – Tokyo flights releasing premium cabin award seats.
When there’s first class available it’s on JAL’s Boeing 777-300ER which has their new first class suites. American charges 62,500 miles each way between the US and Japan (as well as Korea). Make Tokyo your connection and continue on in Asia and first class awards are 67,500 miles each way.