OAG lists MCT but that requires a subscription. That is the best source. Many airlines make MCT available on their web sites, but it is buried in the site and often difficult to find. For example here is the one for AC (one of the easier ones to find, but incomplete): http://www.aircanada.com/en/travelin...tiontimes.html

You could go through each airline's web site and construct a directory -- as far as I know it hasn't been done yet.