Flight bookings can be confusing because airlines offer a number of options to passengers. Many airlines have decided to connect additional charges to flight reservations. The system is generally known as preferred seating. Commonly this has been associated with a window or isle seat. However, the idea of preferred seating does not mean the same to different airlines. For American Airlines it could mean seats closer to the front of the cabin, regardless of whether or not it’s an isle, window or middle seat. On Virgin America, you can pay around $139 for a Main Cabin Select booking. You get early boarding, extra legroom, and unlimited in-flight entertainment, food and drinks. Other airlines with options similar to preferred seating are Delta, US Airways, and United. Make sure you understand what is meant by preferred seating before confirming you booking.