Do not take the shuttle to Terminal A until you have used the bathroom, eaten real food, and found a sense of serenity. This place is a miserable island.
Despite what the signs say, they will not shuttle you from Terminal A to terminal B. You have to go outside of security and back in. Worst airport ever.
International arrivals is a mess. WORST customs experience ever. 2 1/2 hours in line. Terminal B is a huge drawback. Its obvious that more immigration agents are needed.