From 2 different sources

Shareholders of WestJet Airlines on Tuesday voted in favor of its deal to be acquired by billionaire Gerry Schwartz's private equity firm Onex Corp for C$3.5 billion.

More than 92.5% of the votes cast at the special meeting were in favor of the proposed deal, the company said in a statement.

The C$31 per share deal, announced in May, received a green light from Canada's transport minister last month.

WestJet has reported a decline in net profit for each of the last three years, hurt by rising fuel costs, pressure on ticket prices and other problems.

https://www.reuters.com/article/business/westjet-shareholders-approve-private-equity-buyout-idUSKCN1UI2UA/

On May 13, 2019, WestJet announced that it had accepted an offer from Onex Corporation to purchase the company, a $5-billion deal that would require shareholder approval (in July) and regulatory approval. The offer was for $31 a share, substantially higher than the closing price of approximately $18 at the close of trading on the previous business day.

https://en.wikipedia.org/wiki/WestJet

Seems they were losing money and the offer was too good to pass up.