It's using the same flight numbers as the existing LAX-NRT flight, which could indicate LAX-HND would replace LAX-NRT, just like at JFK when JFK-HND replaced JFK-NRT. However, I don't think AA would get LAX-HND since DL already flies that route. The DOT tends to prefer using HND slots for new flights. I think AA would have a better chance of getting DFW-HND.