According to this
http://www.star-telegram.com/news/bu...Haneda%20route AA intends to re-open the T4 FIS facility:
and a new U.S. Customs and Border Protection FIS Facility will open later in 2016 in American’s main terminal at LAX, all of which will elevate the travel experience of American’s U.S.-Asia passengers
This will be great if they open it, but we all know the history on the government's inability to staff it for all flights...