Air Canada 29 from Vancouver, codeshare CA7452. This 77W was delivered in May 2016, relatively new in AC fleet... In fact, it's the newest 77W for Air Canada.
<a href="//commons.wikimedia.org/wiki/User:N509FZ" title="User:N509FZ">N509FZ</a>
<span class="int-own-work" lang="en">Own work</span>