I am not sure if this has already been posted, I can't remember seeing it. So if it has been posted, mods feel free to delete. But it was posted in December 2024:
OAG: Canadian Air Route Tops 2024 List of N. America's Busiest
Canadian city pairs took the first and 10th places for the busiest 2024 air routes in North America, while one U.S.-based route made the global top 10 list, OAG announced Tuesday. Ranks are determined by the volume of scheduled departing seats for flights in both directions.
Vancouver-Toronto was the top North American route in 2024 with nearly 3.5 million seats. Vancouver-Calgary closed out the top 10 list with 2.96 million seats. The eight intervening routes all were for U.S. city pairs. Atlanta-Orlando was the busiest U.S. route at 3.47 million seats, followed by Honolulu-Kahului at 3.37 million. Those U.S. pairs also were the top two in 2023, but in reverse order.
The full list 2024 Busiest N. America Air Routes (measured by departing seats)
1. Vancouver-Toronto, 3,498,835
2. Atlanta-Orlando - 3,474,713
3. Honolulu-Kahului - 3,369,790
4. Las Vegas-Los Angeles - 3,354,849
5. Denver-Phoenix - 3,214,473
6. Los Angeles-San Francisco - 3,158,918
7. New York JFK-Los Angeles - 3,158,654
8. New York LGA-Chicago - 3,118,179
9. Atlanta-Fort Lauderdale - 2,998,172
10. Vancouver-Calgary - 2,960,192
I am shocked to see YVR-YYZ at #1, I don't know if it's the first time that's happened, but I wouldn't be surprised if it was. Routes like ATL-MCO and HNL-OGG are historically such heavyweights, as are many other pairings on the list (ie. JFK-LAX). So it is really an accomplishment for YVR and YYZ to come in at #1 (well, at least for us AV geeks lol, my experience is that average people have little to no interest in airport and airline logistics lol).
Also shocking that YVR-YYC is in the top 10. Not only am I shocked to see the route in the top 10 busiest of North America, but I didn't even think it was #2 in Canada! I knew YVR-YYZ had the most seats i, but I thought either YYZ-YYC or YYZ-YUL would be in 2nd place, so it's wild to see us represent so much. This observation is even more strange: LAX appeared in 3 route pairings, while ATL and YVR appeared in 2 pairings. All others appeared only once. I know this isn't major news or anything, just neat for YVR to be on there twice, beside LAX and ATL, two of the most important airports on earth. Obviously I am not even remotely implying YVR being amongst them means we are in their league. Absolutely not, we're in different galaxies lol, never mind leagues. It's fun just to be mentioned in the same breath.
And it's cool that a Canadian pairing took the crown this year against some heavy hitters. I hate the whole US-Canada situationship at the moment, it's ugly in so many ways. But it's funny just to have a petty brag over our American counterparts

. And having one more Canadian pairing in the top 10 is just further evidence that our place on that list isn't crazy.
Here's some things I either noticed or want clarification on:
1. Although the list calls itself North America, it notably omits Mexico. MEX to CUN and to MTY are busier, but I guess OAG categorizes Mexico under Latin America and not N. America
2. The link article is odd in that it didn't use airport codes, it used city names. Anyone halfway savvy with airports knows that you always use airport codes, it is too unclear otherwise. And other than JFK and LGA, the article doesn't even mention full airport names, and yet there are cities on the list like Orlando, Los Angeles, Chicago, and Phoenix which have significant traffic at multiple airports. So it made me wonder if the list was counting multiple metro airports together? Heck, they could even have added YVR+YXX and YYZ+YHM+YTZ. Luckily the OAG site itself had a downloadable spreadsheet with the data, and thankfully used airport codes. So all pairs are airport to airport, no combining within metros. Even more impressive knowing that. Before I saw the spreadsheet, I thought that combining airports in the same region could explain YVR-YYC a little more, since YXX has a ton of YYC flights and could make the difference to put VAN-CGY into the top 10. But it is just YVR-YYC, YXX traffic is on top of that.
If those two routes weren't enough, Canada appeared again on an another prestigious list. CDG-YUL at #6 on
Top 10 North America International Routes. They are the only Canadian city on this list, so that's very cool. Oddly enough, even though the route came at #6 for NA routes to Europe, on Europe's list of top international routes, YUL didn't even make the top 10. But routes to/from European and Asian countries are massive, it is too unrealistic right now.