With all this talk about London.....
The CAA (Civil Aviation Authority) in the UK has released preliminary March stats. This is probably the best tool to compare different markets as it doesn't just take into account capacity.
http://www.caa.co.uk/docs/80/airport_dat...015_Provisional_International_Routes.pdf
LHR-YYC was up 10% (about 2,200 passengers) to 25,381. That's about a 90.2% LF.
LGW-YYC was down 42% (about 1,400 passengers) to 1,923
The drop in LGW is due to Transat suspending flights for a few weeks in the winter. It resumed late March this year. Next year it is suspended all winter as mentioned earlier.
YEG-LHR was up a whopping 142% (about 570 passengers) to 971
Large % increase due to their direct seasonal flights starting a couple of days earlier this year.
This will drop off in the next few months as their schedule is reduced to 3 weekly from daily last summer, plus Transat has pulled its direct YEG-LGW flights too.