I land in Newark on April 16 at 7:15 pm on Ethiopian Airlines ET508 from Africa. I'm on a flight on a separate booking form Newark to Toornto on Porter Airlines PD 144 leaving at 8:30 ppm. I believe I land and depart from Terminal B. I will only have carry-on luggage. Will I have to leave security and go through customs, exit, and check back in? Or will I be able to stay in the terminal. Thanks!