ITN = www.itn.net

You can use this website to see whether there are still any seats left in the fare class that you desire. It's free to sign up, so you can play around with it once you've signed up. To see the individual fare classes, you have to set your preferences to "expert" mode. If you need any help on it, let us know.

Another useful tool that you could use to calculate Q miles from webflyer: http://www.webflyer.com/milemarker/milemarker.htm