Delta Air Lines has released a new online "Ticket Window," a web applet that debuted on the carrier's Facebook page on the "Book a Trip" tab. The applet allows travelers to search for and book a Delta flight without leaving Facebook. According to the airline, the applet also will appear on other social media sites, as well as in banner ads, making it possible to book flights without leaving the site on which the Ticket Window appears. The new technology is part of Delta's enhanced focus on web and mobile booking, and coincides with a redesign of the company's home page. A new iPhone app will be released in a few weeks.