I don't see the value in this incrementalist approach to capacity build out. Why not just invest in a properly designed new terminal somewhere else on the airfield??
These "renovations" are not going to produce a pleasant travel experience, and will lead to pretty bad inefficiencies for operators.
Surely we can build something like Fort McMurray's (population: 76,000) terminal at YHM??
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You could build it, but it would cost a fortune. Fort Mac is mainly "business traffic" in oil field crew rotation.
In southwest florida, almost mid way between Tampa and Fort Myers, among the many airports is SRQ the Sarasota-Bradenton International airport. Up until 1989 it contained a very small terminal building with no bridges and parking for about two or three 727s or DC9 sized airplanes. This section of southwest Florida underwent massive growth in the mid 80s and a new terminal was approved to be built by the county owned airport. A ten to 14 bridge terminal along with two or three commuter gates was built starting in the late 1980s and opened in the fall of1989. All seemed well until Gulf war one happened. A major tenant, Eastern Airlines, went bankrupt and ceased operations in January of 1991. Things looked bleak. You could shoot a cannon down the spine of the terminal and not hit anyone. American, United, TWA had token service. USAir, Delta and Continental had a bit more if I recall. By the late 1990s, both United and American pulled mainline jet service. American ran turboprops to Miami. And then that got cancelled. By the early 2000s, it looked grim and the airport was on the brink of closing. I'm not so sure they weren't waiving the landing fees for carriers like Air Transat that ran A310s for a season. They tried hard to get some of the European charter carriers from the UK and Germany to run a program but I can't recall if anyone ever did.
SRQ was caught in the middle. It was almost equidistant between Fort Myers and Tampa. Those two airports had a lot more frequency and service. After the financial crisis in 2008, things began to rebound. Some of the discount carriers began servicing Sarasota. Mainline carriers came back. The region grew to the point where the facility gained the critical mass needed. A lot of people didn't want the I-75 drive to Tampa. tampa embarked on their own terminal renewal project that made things challenging.
SRQ just opened about a year ago a new concourse for Spirit to use. The airport now ranks 42nd in the USA for traffic.
So yes, at some point in time, a larger terminal at YHM makes sense, probably when YYZ is maxed out. This thing they are doing now will only end in frustration and tears. People might even try it once. Summertime domestics (heck, even winter ones) it will probably be great. But if I'm in the west end and I'm looking to go to say, Florida, I'm not going out of Hamilton. I can likely go out of Pearson for less money - or Buffalo for even less - pre-clear customs instead of customs on arrival at FLL/MCO, have a choice of five or six departures a day, and not have to walk in the cold to get to Canada customs on my return.