Air canada tsa precheck because passengers who meet certain requirements can benefit from expedited security inspections at airports in the United States. TSA PreCheck participants are permitted to keep their belts, shoes, and lightweight coats on while leaving laptops and liquids in their bags. To use TSA PreCheck, travelers must enter their Known Traveler Number while creating a new reservation or adding to a current one. Your boarding card will then have the TSA PreCheck symbol on it, allowing you to access the designated lanes. TSA PreCheck is only offered by Air Canada for flights departing from U.S. airports; it is not available for flights that begin in Canada.