While a decent discount is this truly MR Deals material? Here's more fine print sure to catch FT MRers eyes:

http://www.aircanada.com/en/offers/a...s.html#-OFFER1

This promotion code is available on one-way and round trip itineraries and does not apply on multi-city itineraries. If you are not departing or returning from the same city, or your itinerary includes a stopover, in order to take advantage of this offer, you must make multiple bookings.