YuropFlyer is exactly right with the description and assessment. One thing I will add: if you get a deplaning gate that is far from Immigration, it is a LONG walk. In order to have a chance of making this flight, you need to have a seat that lets you deplane quickly and then walk as fast as possible to the Immigration where you will see "International Transfer" on the far right side as YF described. F/J deplanes first and quickly, but if in Y, get a forward seat if you can.