Want to add leisure to your journey? You should book an extra seat while planning a trip. How to Book Extra Seat on Delta Airlines? Are you thinking about the same? Fret not because the airline features a simple procedure for your help. Purchasing an extra seat would give extra comfort to you. You can book two seats to make the most of your time in the air. Use the live chat option if you wish to avail assistance regarding the additional seat selection policy. Get in touch with agents for immediate assistance.