How many times have you booked a flight, only to board the plane and realize that you have nearly the worst seat possible? Most airlines make it possible to book a specific seat in advance, but if you don’t know the exact layout of the plane, you might not be able to figure out which ones are good and bad. That’s where SeatGuru comes into play.

This handy site will allow you to enter your flight number, and it will pull up a map of the available seating. It then ranks the seats and points out which ones are good/bad, and even gives you some insight into the way space is used on a particular plane. I would say that this site is essential for anyone that flies on a regular occasion.