Originally Posted by NewEnglandTrv

Posting on behalf of my manager-- just want to verify something. He is flying from NRT to YYZ, and connecting to a flight to BOS. We think he needs to clear US customs in Canada, but just want to make sure that is the case and he won't end up clearing US customs in BOS. He wants to be sure this is the case, as it will determine whether he checks or carries on bags. Thanks.