No, I don’t think it will have a big effect on Toronto YYZ, Vancouver YVR & Montreal YUL Canada’s 3 busiest airports

.
Although I could see (some US

flight

cuts) quietly by airlines at medium & smaller sized airports in Canada

like : Calgary YYC , Edmonton YEG , Winnipeg YWG, Ottawa YOW or Halifax YHZ . Where a few cancellations here & there & with consolidation of some Canada -US flights, at these airports

.
(*If*) Canada - US passengers demand drop as we get closer to the (Summer 2025) due to the Trade War /Tariffs ,
I could see WS WestJet maybe

deciding to cut the *new* Calgary YYC - Anchorage ANC 2x weekly route for this Summer & push it back to (S26). As it will free up a WS Boeing 737 scheduled for 2x weekly to ANC to be used on a higher demand route.