Under Canada's Air Passenger Protection Regulations (APPR), if your flight is cancelled due to a labour disruption, airlines must offer you a choice between a cash refund or a rebooked flight.
"Customers travelling between Norman Rogers Airport and Toronto Pearson on Landline's premium motorcoaches will enjoy the same benefits as those making air-only connections, including the convenience of a single itinerary and through-tagged baggage when departing Kingston."