The 767 family is a complete family of airplanes providing maximum market versatility. The twin-aisle twinjet- is the most widely used airplane across the Atlantic, and is available in four models: the 767-200ER (extended range), with seating for 224 passengers in two classes or 181 passengers in a three-class configuration and range of up to 6,615 nautical miles; the 767 -300ER, with seating for 269 in two classes and 218 in three classes and a range capability of 6,115 nautical miles; and the 767-300 Freighter with 16,034 cubic feet of cargo volume and a range of 3,270 nautical miles. The newest member of the 767 family is the 767-400ER. The 767-400ER has seating for 304 passengers in two classes, or 245 passengers in a three-class configuration with a range of up to 5,645 nautical miles. Deliveries of the 767-400ER began in August 2000. Boeing has committed to production a longer-range 767-400ER. The new longer range 767-400ER flies the equivalent rang eof the smaller extended-range 767-300ER, but has the capacity of the larger 767-400ER. This airplane is an ideal replacement for earlier long-range trijets, and the capacity needed for markets that have grown beyond the popular 767-300ER. The Boeing 757 and 767 were the first, and still are, the only airplanes to share a common type rating. The common type rating is due, in part, to airplane systems that are designed such that a common set of flight crew operating procedures can be used. Airlines that operate both the Boeing 757 and 767 have greater flexibility in assigning flight crews and adapting to changing markets. They also benefit from similar maintenance procedures, manuals and inspection requirements and reduced spares inventories. More than 26 airlines around the world operate both 757s and 767s.