Participating in the TSA PreCheck program allows travelers to take advantage of expedited security screening at airports across the United States, Air Canada TSA PreCheck including Air Canada. Holders of a TSA PreCheck are permitted to take off their shoes, belts, and light outerwear. The only items that can be brought in carry-on luggage are computers and compliant liquids. To use TSA PreCheck with Air Canada, make sure your Known Traveler Number (KTN) is put into your reservation during check-in or in your frequent flyer profile. Your boarding pass will bear the TSA PreCheck emblem if you are eligible. This service is available to flights departing from certain Canadian airports that are bound for the United States.