Bid For an up grade: Some airlines help you bid for an upgrade to business class. It is possible to submit a bid to the up grade and when it’s approved, you’ll be upgraded at a reduced amount. I very recommend receiving the Elite Model of Scott’s Cheap Flights (now https://businessflightshop.co.uk/blog/board-a-flight-to-canada-from-uk-know-the-finest-accommodation-in-bromont/