Originally Posted by FatBoyYVR
It was a good question. One thing worth looking at is when you get a fare with an X one way and a W the other. As was pointed out, the W (weekend) will be more expensive (and what is defined as W i think can be pretty extensive) but if you want to save a few dollars and can be flexible, you can shift the date, get both as an LLX... and the difference can be a fair bit.
Generally, I am pretty knowledgeable on fares etc. but with such a low (C$633.75 all in) fare on AC (AC856 & AC859), I was wondering if there was a catch like not being eligable for Q miles etc. I take these flights a few times a year for a guys weekend in London and this has been the cheapest I have seen in a while. I have also heard of stories of some of the discounted Expedia fares sometimes not being eligable for accumulating miles.