Sure about that? YHM seems to be the alternate of choice if the weather is good enough in YHM but not good enough to go contact (no alternate IFR).
AC will use YOW as the alternate the majority of the time, as they already have the staff in place to assist passengers in the likelihood that they have to disembark, and also relief crews in case pilots or f/a's max out.
YHM does not have AC service. So it's just common sense that AC will choose YOW over YHM most of the time, fuel and weather permitting, of course.
That's a good chunk of YYZ traffic right there choosing YOW.
Most international carriers (non U.S) will also choose YOW. pure geography. When the weather is coming in (usually from the west and is over YYZ, and probably over YHM as well) they have nowhere else to go but YOW or YUL which are still in the clear.
yes, meant standard, not official.
yes, Transborder airlines will go back to the states, namely BUF
. Its cheaper than YOW and they also have staff there to assist passengers in the event they have to disembark, because most feeders already serve BUF.
Just like those headed to YUL
will often choose BTV
as the alternate. They can very easily land at, say.... PBG, it's probably cheaper. But they dont because most of them already serve BTV and its less complicated (fuel contracts, staff, avlb of pilots...etc)
Canadian operators or intl carriers from Europe or Asia often choose YOW, pure and simple. (always weather and fuel permitting, of course)
When YUL is weathered out, and YMX is still avlb, AC and Jazz can very easily land there, refuel, and do the short hop to YUL when it opens up, yet i've never seen them there. They always come to YOW or go to YYZ, for the very same reasons mentioned above.
[Edited 2013-02-10 14:04:17]
us Air Traffic Controllers have a good record, we haven't left one up there yet !!