Most full service airlines typically cabins that have two or three classes of service and fewer total seats in each aircraft; seat size and available seat pitch is typically more generous. For example, Delta has 124 seats in its Airbus A319 aircraft, whereas Frontier (a low-cost airline) employs 136 seats in an identical A319. Full service airlines will typically offer more in-flight perks such as a greater selection of food and beverages, in-flight entertainment options and amenities like headphones, pillows and blankets; recently, though, some full service airlines have cut back some or all of these perks, or now charge for them.
Read more : http://www.ehow.com/info_8240676_features-full-service-airlines.html