Yes- this probably belongs in the Tokyo area forum since it is about the airport and trains, and not about AA. There is probably already information there on similar topics, so it might not even need a new thread there.
Cheers.
The prevailing discussion over there is that it is probably best to stay at the JAL Haneda Hotel for around $120 the night before, since they have a shuttle to the airport that arrives in time for checking in for this flight.