2 hours is enough time but you will need to go through customs and security again. Your arrival and departure terminal will be different as the new Schengen terminal is not the same as the LONGGGGG, older internatinal terminal. After going through customs the American Airlines flight will depart at the very end of the long terminal-a decent walk. All U.S. bound flights depart from this secure area and you will need a boarding pass to get pass securtiy that gatekeep this particular point. As a result I believe you will need to pick up your AA boarding pass at a transfer desk before reaching the gate. While I am not sure where their transfer desk is they certainly should have one since they have a good relation with Sabena, codesharing on many flights. Lastly, the terminal AA uses really lacks food and shopping outside of the main entrance and that is where the lounges are too (upstairs). Once you venture to your departure gate you are out of luck on any selection of food or goods.