https://www.cnbc.com/2017/11/07/priceline-tripadvisor-shares-crater-after-weak-profit-outlooks-from-competition-with-airbnb.html

Priceline and TripAdvisor shares both plunged Tuesday after the online travel firms warned about future results because of in increase in spending in response to mounting competition.

Shares of TripAdvisor fell more than 18 percent, on pace for its worst day since Nov. 2016. Priceline fell 10 percent, on track for its worst day since June 2016.