For flights departing to the United States you will clear U.S. Customs and Border Protection in Toronto. This means you arrive in the United States as a domestic passenger. The hours of operation for pre-clearance are 0430-2030 daily. Should you have any questions related to travel into the United States (i.e. documentation/visa requirements, plant/animal or food restrictions) you may reach their Info Centre at 1-877-227-5511 (international callers dial 00 1-202-325-8000) or through the following link: