I'm traveling DFW-NRT-HKG in late April. DFW-NRT is on American; NRT-HKG is on Japan Airlines. I booked the itinerary on a single reservation with American.

Anyone done this before? What should I expect in Tokyo? Will I need to go through immigration, claim bags, and recheck at the JAL counters? Or will my bags automatically be transferred from AA to JAL?

Any advice is much appreciated.