Scale : 1/100
Wing Span : 20.5"
Length : 24"
Code : KB7674DTR

The 767-400ER is the final extended variant and was launched in 1997 on an order for Delta Air Lines and Continental Airlines to replace their aging Lockheed L-1011 and McDonnell Douglas DC-10 fleets, respectively, following both airlines rejection of Boeing's previous 777-100X  proposal. Other airlines also placed orders, but these were eventually canceled or converted to other Boeing models. The 767-400ER is a major development over the 767-300. The -400ER was stretched 21.1 ft (6.43 m) from the -300 for a total of 201.4 ft (61.4 m). It also featured a new glass cockpit, redesigned wings with a wingspan increase of 14.3 ft (4.36 m) over the previous two variants, larger passenger windows, new passenger cabin and redesigned landing gear. The -400ER is the only 767 variant to also feature "raked" wingtips for increased fuel efficiency. Its first flight was on October 9, 1999, and entered into service with Continental Airlines on September 14, 2000. This variant is only available as the 767-400ER, as there was no 767-400 variant. However it has less range than the other two ER variants.

Boeing offered a longer range version, named 767-400ERX for sale in 2000. It was introduced along with the Boeing 747X and was to be powered by 747X engines. The -400ERX offered an increased maximum takeoff weight of 465,000 lb (211,000 kg) and range of 6,150 nmi (11,400 km). Kenya Airways provisionally ordered three -400ERXs to supplement their 767 fleet. However, in 2001 Boeing canceled -400ERX development. Kenya Airways converted their order to the 777-200ER. The 767-400ER's closest competitor from Airbus is the A330-200. The 767-400ER is expected to be replaced in Boeing's line-up by the 787-9. As of 2010, 38 Boeing 767-400ERs have been delivered, with 16 to Continental Airlines and 21 to Delta Air Lines. A total of 37 767-400ERs were in airline service as of July 2009.