my understanding with T+ is that if the fare drops within 24 hours, u can request refund and rebook it yourself.....
they only match prices with external travel agents/websites for the same flight within 24 hours plus $50 cashback per pax. Terms and details are here:
http://www.aircanada.com/en/travelin...tee/index.html
because most airlines these days utilize a yield management system to determine supply & demand for its fares, prices can go up or down...so there would be no guarentee after 24 hours...... otherwise everyone would request refund for the difference, not make money and in turn have AC go flat fare instead.