Did not clear a SFO-HND from Z with F3A3, but I might have listed it too close to departure (at 30 hour mark approximately). The waitlist did not fall off until 5 hrs before departure. Return NRT-SFO cleared ~3 days before departure was F5A5.

Apparently these are manually cleared in some office in Japan. Unclear to me if it's possible to clear within 24 hrs or not.