I am currently seeing quite a few close-in business class saver awards on United and ANA within <14 days of departure. Unfortunately Air Canada seems to be blocking ANA awards now, and United charges 100k each way for its own metal and 110k for ANA metal, so the best options for booking these may be Avianca, ANA (if you can book round trip), and Virgin Atlantic (for ANA flights only). The latter two have relatively high cash surcharges but relatively low mileage requirements. JAL, American, and Delta business class availability seems much rarer, although they release quite a bit of premium economy.