Viscount724 From Switzerland, joined Oct 2006, 21472 posts, RR: 24 Reply 3, posted (3 years 8 months 3 weeks 6 days 8 hours ago) and read 1991 times:
Quoting JRadier (Reply 1): It doesn't strike me as odd. Calgary is a beautiful tourist destination in summer, but a lot less appealing in winter
One problem with only 4 flights a week during the winter is that winter is the busiest period for business travel, but those high-yield passengers prefer carriers with daily or close to daily frequency to provide more flexibility if their plans change. During the time of year when the highest-yield passengers are travelling, KL becomes a less attractive option compared to AC to LHR/FRA and LH to FRA (I think those are all daily services through the winter), or BA to LHR at 6 a week. With only 4 a week, there's too much risk that if you want to change your travel dates by a day or two, KL won't have a flight that day.