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McDonnell Douglas MD-11

Boeing · Widebody / Heavy / Commercial Aviation · USA · Cold War (1970–1991)

The McDonnell Douglas MD-11 is an American three-engine wide-body airliner — the DC-10 successor from McDonnell Douglas (and later Boeing after the 1997 merger), and the last commercially meaningful tri-jet airliner ever produced. Development ran from 1986 to 1990, with first flight on 10 January 1990 and service entry with Finnair on 7 December 1990. About 200 airframes rolled off the Long Beach line between 1990 and 2000. Today the type survives in cargo service with FedEx (the largest historical operator, around 50 aircraft), UPS, Lufthansa Cargo, Western Global Airlines, and Sky Lease Cargo.

Power comes from three General Electric CF6-80C2 or Pratt & Whitney PW4460 turbofans. Maximum cruise is Mach 0.85, range reaches 12,455 km in passenger configuration or 7,200 km with a full freighter payload, service ceiling is 13,100 m, and MTOW is 286,000 kg. Cabin layouts run from 293 seats in a three-class arrangement up to 410 in high density. The airframe itself is a stretched, re-engined, winglet-equipped derivative of the DC-10, paired with a digital glass cockpit, more fuel-efficient engines, and a larger wing. Composite and high-strength alloy structure was used extensively to trim weight.

Commercial service exposed serious shortfalls. Launch brochures promised 13,400 km of range, but real aircraft delivered 12,000–12,500 km — roughly 1,000 km short — thanks to weight growth and higher-than-forecast drag. Swissair, Singapore Airlines, and KLM trimmed or cancelled their orders. Passenger flying ended in 2014 when KLM retired its last MD-11, while FedEx and UPS pressed on with freighter operations into 2024. FedEx withdrew its final MD-11Fs in May 2024 as fuel costs climbed. UPS still flies about 30 MD-11Fs as of 2026, though incoming Boeing 767Fs are steadily replacing the fleet. The worst loss came on 2 September 1998, when Swissair 111 went down off Halifax following an in-flight fire, killing all 229 aboard — an accident that helped push airlines out of MD-11 passenger service.

For Kids — a shorter, friendlier version

The McDonnell Douglas MD-11 is an American three-engine wide-body airliner. It was the last major three-engine airliner ever built. The MD-11 first flew in 1990 and entered service the same year with Finnair. About 200 MD-11s were built between 1990 and 2000.

The MD-11 has three turbofan jet engines: two under the wings, plus one on the tail. The engines can be General Electric CF6 or Pratt and Whitney PW4460 type. Top speed is about 567 mph, faster than most race cars. The plane is 201 feet long with a 170-foot wingspan, longer than a Boeing 737.

The MD-11 grew out of the older DC-10 trijet. It has a longer body, new winglets, more-efficient engines, and a modern glass cockpit. Sadly, the MD-11 had a problem: it could not fly quite as far as Boeing had promised. Some airlines like Swissair, KLM, and Singapore Airlines cut back their orders.

Passenger flights with the MD-11 ended in 2014 with KLM. FedEx and UPS kept flying MD-11 cargo planes for years. FedEx retired its last MD-11s in May 2024 because of high fuel costs. UPS still flies about 30 MD-11 cargo jets in 2026, but plans to retire them in the next few years.

Fun Facts

The MD-11 has three engines: two under the wings, plus one on the tail.
It was the last major three-engine airliner ever built.
About 200 MD-11s were built between 1990 and 2000.
Top speed is about 567 mph, faster than most race cars.
The MD-11 is based on the older DC-10 trijet.
FedEx retired its MD-11s in May 2024.
UPS still flies about 30 MD-11 cargo jets.

Kids’ Questions

Why three engines?

In the 1980s, rules said long over-water flights needed three or four engines for safety. The MD-11 used three to fly across oceans, with the third engine high on the tail. New twin-engine rules in the 1990s made trijets less needed, since twins like the 777 could now fly long over-water routes.

Why was the MD-11 disappointing?

McDonnell Douglas promised the MD-11 could fly 8,300 miles, but actual planes flew about 7,500 miles. The plane was also heavier and used more fuel than promised. Several airlines cut back their orders. This bad start hurt sales, and only 200 MD-11s were built.

Why fly cargo MD-11s?

Cargo airlines bought used MD-11 passenger planes cheaply and turned them into freighters. The big body holds lots of cargo, and the three engines work fine over long routes. FedEx and UPS got 20+ years of cargo service from each MD-11. As fuel prices rise, they are slowly being replaced by newer twin-engine cargo planes.

Variants

MD-11 (passenger): Original baseline. Largely retired from airline service by 2014.
MD-11F (freighter): Cargo variant; the most numerous version built.
MD-11C / CF (combi / convertible): Mixed freight-and-passenger configurations.

Notable Operators

FedEx (1991-2024): Largest historical operator. Final retirement May 2024.
UPS (2003-present): Still flying about 30 freighters.

Frequently Asked Questions

What caused the Swissair 111 crash?

Swissair Flight 111 went into the Atlantic off Halifax, Nova Scotia on 2 September 1998, killing all 229 people on board. The cause was an in-flight fire that started in the wiring of a recently fitted in-flight entertainment system — the Hughes-Avicon installation, which had not been certified by the US FAA. Insulation around the system ignited from electrical arcing in the cabin overhead area, and the fire then ran along the MD-11's polyethylene insulation into the cockpit, destroying flight controls. The Canadian Transportation Safety Board investigation drove sweeping safety changes: improved cockpit-fire procedures, new fire-resistant insulation standards, and eventually certification rules restricting flammable materials in IFE installations. It remains the deadliest MD-11 accident and was a major factor in airlines abandoning the type for passenger service.

Sources

Wikipedia — McDonnell Douglas MD-11