Delta Air Lines unveiled a new feature on its Facebook page on Thursday that allows flyers to book air travel entirely through Facebook. Dubbed the "Ticket Window," the new tool comes just days after the company gave its homepage a thorough redesign as part of what Delta says is a larger plan to improve the online experience for customers. Delta says other plans include improvements to airport kiosks and a new iPhone app that will let flyers check in, research their flight status, check frequent-flyer-mile balances and even set parking reminders. Passengers in certain hub cities will be able to use the app as a boarding pass -- a feature already available on the airline's mobile site. CNN