You don't have to look far. The U.S. is one. Canada went a different route than the U.S., and that happened decades ago. The Americans invest in their airport infrastructure, whether it's public or private, as soon as the airport offers commercial flights. The Federal Aviation Administration in the U.S. covers 90% of infrastructure costs. Here, in Canada, airports are told to look after themselves. That is why Montréal‑Trudeau International Airport, Québec City Jean Lesage International Airport and other such airports are forced to pass on infrastructure improvement costs to passengers. It's the same thing for regional airports.
I will say that we receive some help through infrastructure programs, but they don't cover all of the debt associated with capitalization or operational losses stemming from the fact that our airports have fewer passengers than our larger counterparts.
Canada could certainly do a number of things to remedy the situation, and all it has to do is take its cue from its neighbour to the south, the U.S.