By the end of the year, Booking.com will have TV advertising campaigns in as many as 30 countries, up from 12 last year, Priceline CEO Glenn Fogel said on a conference call with analysts Monday. Additionally, the company will try to further its growth in sales of vacation-rental units. As of Sept. 30, Priceline boosted its vacation-rental inventory by 58% from a year earlier to about 816,000 units. As a result, Priceline forecast fourth-quarter earnings, excluding certain items, to be about $13.70 a share, about 14% less than the average analyst estimate of $15.57 a share. Priceline shares fell more than 9% in after-hours trading on Monday. Get the full story at Travel Weekly and Priceline (PDF 250 KB) Read also "Booking.com rethinks digital advertising in favor of TV" at Skift