With the current APPR, the airlines do have responsibility for events beyond their control (which includes labour action), the least they have to do is provide a refund at PAX request, but certainly within 14 days from first flight on an itinerary they need to arrange alternative flights on another carrier within 48 hours of the original flight time if a PAX requests that instead of a refund. The way the APPR is written it is not clear whether a full refund to the original form of payment is good enough when the first flight on the itinerary is more than 14 days in the future (this is an area that could be subject to legal challenge). Here is the APPR wording from https://rppa-appr.ca/eng/right/flight-d ... cellations :
“Situations outside the airline's control
(for example, weather conditions that make it impossible to safely operate the aircraft)
Summary of rebooking and refunds for situtions outside the airline's control
The airline (large or small) must rebook you on its next available flight or on the flight of an airline with which it has a commercial agreement. The flight must depart within 48 hours after your original departure time. If the airline cannot rebook you within 48 hours, the airline must, at your choice:
Provide a refund; or
Make alternate travel arrangements, free of charge. The details of the new flight depend on the size of the airline, as follows.
If you chose alternate travel arrangements
Large airlines
Large airlines* must rebook you on a flight operated by any airline. The new flight must take any reasonable route out of the same airport or from a nearby airport to your destination. In that case, they will also have to transport you to that airport.
*The size of the airline is listed in the terms and conditions of your ticket (the airline's tariff). Air Canada (including Jazz) and WestJet are currently large airlines.
Small airlines
Small airlines* (for example, Sunwing, Air Transat, Porter, Swoop or Flair) must rebook you on their next available flight or on the flight of an airline with which they have a commercial agreement. The flight must take any reasonable route from the same airport to your destination. Small airlines are not required to rebook you with an airline with which they do not have a commercial agreement.
*The size of the airline is listed in the terms and conditions of your ticket (the airline's tariff). Sunwing Airlines, Air Transat, Porter, Swoop and Flair Airlines are currently small airlines.
If you chose a refund and you're no longer at your point of origin
If your trip no longer serves its purpose because of the delay or cancellation, and you're no longer at your point of origin (for example, if you are at a connecting point), then the airline (large or small) must rebook you on a flight back to your point of origin that accommodates your travel needs, free of charge, and refund the entire ticket (as if no part of the trip had been made).”