Visiting http://www.aircanada.com causes WebKit to beachball - monitoring its memory usage in Activity Monitor, its virtual memory keeps increasing. WebKit never recovers, and needs to be force quit. The problem does not appear in Safari 4.0.3.
Which country + language did you select from the home page? I’m able to load it + the US English page with tip of tree WebKit without any problems.
I don't get a country/language selector, I automatically get taken to the Canadian page. I have deleted all cookies, so they might be geolocating my IP.
Loading http://www.aircanada.com/en/home.html is partially successful, but before the page finishes loading, WebKit freezes and begins quickly allocating itself more and more virtual memory.