Any idea why Air Canada requires TSA pre qualified travellers to reprint their boarding pass at the airport. This step really does increase the time required getting to the gate, particularly in large airports such as O'Hare or DFW. United will happily allow passengers to either print TSA pre boarding passes, or receive mobile TSA pre boarding passes (I guess the latter might be asking a bit much from AC). This is the message printed on boarding passes from AC OLCI: You've been cleared for TSA Pre✓™. To use this service at a participating airport you must reprint your boarding pass at a self-serve kiosk (where available) or see an agent.