Don't know? I always thought so. We had to do it the last time and you have to do it in the US. Leslie said they checked them through for her. I am going to call her tonight to see what happened. I hate the idea of lugging the bags from one terminal to another by myself. I have hours to kill though. I arrive at 7:40am and don't leave until 1pm. I was looking forward to a facial at terminal 5!