Originally Posted by
LGANightOwl
The connecting process may be a question that's better to post in the specific airlines forums. This forum targets NYC and the people answering it are typically from NYC, so we really don't connect through JFK - we END at JFK.
The connection process generally is the same, irrespective of the airlines, except to the extent one needs to change terminals. All passengers arriving on flights from Europe must first clear immigration, then claim their checked luggage, and then clear customs. They then can recheck their luggage to their final destination.
AeroMexico operates out of Terminal 1 at JFK. If the OP's flight comes into Terminal 1, then after clearing customs he can go directly upstairs to AeroMexico. If arriving to another terminal, the OP will have to take the AirTrain to Terminal 1. After exiting customs, follow the signs to the AirTrain and board the "All Terminals" train to Terminal 1.
Either way it's easy, and 3:50 is more than enough time.