LTU is serving YYC on a regular, albeit seasonal, basis during the winter. I'm assuming trips to the Rocky Mountains are the lure. LTU will then begin seasonal service to YVR beginning in May. Nice to see more European carriers serve Canada during the winter.
LTU announced a weekly flight DUS-YYC-DUS on Mondays starting in November or December '04. Due to low pax numbers they canceled all of the flights until January and had to rebook the existing bookings on other airlines (mainly AC) which is quite costly. But it seems to be cheaper than flying the route with a nearly empty plane. So I'm not sure, if this route will be flown next winter.