https://www.cnbc.com/2018/11/05/travel-giant-booking-spent-1-billion-on-google-ads-in-the-quarter.html > Online travel giant Booking Holdings spent upwards of $1 billion on Google ads in the past quarter, according to its earnings report and analyst estimates. > Booking, which owns Europe's Booking.com and U.S. businesses including Priceline and Kayak, said on Monday that it shelled out $1.3 billion on "performance marketing" in the quarter, up from $1.2 billion a year earlier. That spending was "primarily related to the use of online search engines (primarily Google)," and other online services, according to Booking.