https://canadianaviationnews.wordpress.com/2021/03/27/westjet-jetblue-bamboo-airways-secure-london-heathrow-slots/
Westjet obtained slots to London Heathrow for daily flights to Calgary and Vancouver. The Canadian carrier was allocated 732 slots, allowing it to start services as soon as May 1. Currently, the low-cost Canadian airline has slots at neighboring Gatwick that allow four daily services a day to Calgary, Halifax, Toronto and Vancouver. It is unknown whether WestJet will utilize Heathrow instead of Gatwick.
The flights will operate from Terminal 2. From Heathrow’s Terminal Finder tool, it displays a slot for a 9 a.m. arrival and 11 a.m. departure for Vancouver service and 11:20 a.m. arrival and 1:20 p.m. departure for Calgary service.
Tentatively, WestJet has filed a return to London at the end of May as the airline plans its return to transatlantic service when Canadian borders reopen. Last year, WestJet resumed 3x weekly service from Calgary to London Gatwick before canceling it due to the closure of Canadian borders.
These flights will operate using WestJet’s Boeing 787-9 featuring 320 seats, including 16 business class seats in a 1-2-1 configuration, 28 premium class seats in a 2-3-2 configuration and 276 economy class seats in a 3-3-3 configuration.