The first Boeing 767-400ER destined for launch customer Delta Air Lines lands at Seattle's Boeing Field following a test flight. The new jetliner is the first of Delta's 21 767-400ER's on order, with options for an additional 40. These airplanes will join more than 100 767s already in service at Delta, which also operates 113 757s - giving it the world's largest 757/767 fleet. The 767-400ER is the first new airplane certified in the 21st century. The airplane is the newest member of the 767 family, a 21-foot stretch of one of the world's most popular jetliners, the 767-300ER. Delta's 767-400ER configuration seats 287 passengers in two classes: 36 in first and 251 in economy.