If a carrier has reasonable grounds to think a passenger's documents might go missing before they reach the border, it has to hold those documents itself and give the passenger a receipt. At the port of entry it presents the person, the documents, and a copy of the receipt together. The point is to stop documents from disappearing between the plane door and the examination desk.
(1)If a commercial transporter has reasonable grounds to believe that the prescribed documents of a person whom it carries to Canada may not be available for examination at a port of entry, the commercial transporter must give the person a receipt for the documents and hold the documents until examination.
(2)A commercial transporter that holds the documents of a person must, when presenting the person for examination under paragraph 148(1)(b) of the Act, present the documents and a copy of the receipt.