I don't know how the airline would handle a challenge to the Canadian Charter of Rights.
Under Canada’s Charter of Rights and Freedoms, it guarantees Canadian citizens and permanent residents the right to travel between provinces and territories,
and to leave and enter Canada as they wish.
These rights – considered “democratic” rights – are not subject to the Charter’s notwithstanding clause, meaning the government cannot pass legislation or
regulations that limit Canadians’ freedom of mobility.
The are now starting a pilot program at Pearson International Airport. All International Passengers are to receive Covid-19 testing upon arrival.
Failure to comply, or receive a positive test, results in a 14 day confinement at Government designated facilities at the passengers expense.
I am not sure if this would be followed by a further 14 day self-confinement at the passengers residence
The Government could get around this by closing down its infrastructure as long as they could satisfy the courts