Kayak is owned by the parent company of Priceline. Skyscanner is Chinese owned. Google Flights makes most of its money by selling the software to airlines and travel companies and a small amount from bookings. Kayak and Skyscanner make their money from ticket sales via their website. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.