From Sunwing.ca

July 8, 2021: Domestic flight cancellations

Please note that due to ongoing travel restrictions, our summer domestic flight program has been cancelled for all flights within Canada. Customers with impacted flights will be contacted over the coming weeks.

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Source: https://canadianaviationnews.wordpress.com/2021/07/14/sunwing-cancels-domestic-flight-program-for-summer-2021/