WestJet expressed outrage and said it would hold the union accountable for the costs and stress involved.
It is stated that the reason for the aircraft mechanics' protests was "the airline's unwillingness to negotiate with the union."
The strike affected both international and domestic flights, falling over the Canada Day long weekend.
Earlier this month, mechanics voted to reject a previous agreement with the Calgary-based airline, prompting WestJet to appeal to the government and resulting in two strike notices issued by the union.
WestJet expressed outrage at the situation and said it would hold the union fully accountable for the inconvenience and damages caused.
The union bargaining committee, in turn, referred to an order from the Canada Industrial Relations Board, which does not prohibit strikes or lockouts during the arbitration process.