McDonnell Douglas DC-9

Updated: October 2026 – A slim jet, two engines at the rear of the fuselage, the horizontal stabilizer high up on the fin: that is what short-haul flying looked like in the 1970s in Zurich, Vienna, Copenhagen or Amsterdam. The McDonnell Douglas DC-9 was one of the most important short-haul jets in the world for decades and the starting point of a family that extends to the Boeing 717. Here you learn how to recognize the DC-9, how Series 10 to 50 differ, which European airlines flew it and where you can still find it today.

What is the McDonnell Douglas DC-9?

The DC-9 is a twinjet narrowbody for short and medium routes. It has one aisle, with five passengers seated side by side in economy. Depending on the series, it was certified for 109 to 139 people. Two pilots sit in the cockpit – a flight engineer, as the big jets of that time required, was not planned.

It was developed in the early 1960s at Douglas Aircraft in Long Beach. The idea: a small jet that also copes with short runways and smaller airports and replaces propeller aircraft there. That is why the engines hang at the rear of the fuselage, the wing stays clean, the aircraft sits low on short gear legs, and a built-in stair makes it independent of passenger stairs on the ground. Douglas supplied the big brother for long-haul with the four-engine DC-8.

The first flight took place on February 25, 1965. Already on December 8, 1965, the DC-9 entered scheduled service with Delta Air Lines. Demand was high, production barely kept up – and the high costs of the ramp-up contributed to Douglas merging with McDonnell in 1967 to form McDonnell Douglas. You can find more on the company history on the page about McDonnell Douglas.

By the end of production in 1982, 976 DC-9s had been built. After that the family continued in stretched form: as the MD-80, the MD-90 and finally as the Boeing 717, after McDonnell Douglas was absorbed into Boeing in 1997.

The three features that are enough to identify it

Rear engines and a T-tail were found on several short-haul jets in the 1960s. With three looks you can still narrow down the DC-9 with confidence.

In the end, the registration confirms the type and the series. How to read and trace registrations is explained in the guide Understanding aircraft registrations. You can find the basics of type identification in Recognizing aircraft types for beginners.

The versions at a glance

The DC-9 grew in several steps. All series use Pratt & Whitney engines of the JT8D family; you can read more about the engine manufacturer at Pratt & Whitney.

Series	Built	Length	Launch customer / introduction	Special feature
DC-9-10	137	around 31.8 m	Delta, December 1965	Original version, shortest DC-9
DC-9-20	10	around 31.8 m	SAS, January 1969	short fuselage, longer wing, more powerful engines
DC-9-30	662	around 36.4 m	Eastern, February 1967	most-built series, including the C-9
DC-9-40	71	around 38.3 m	SAS, March 1968	SAS’s wish for more seats
DC-9-50	96	around 40.7 m	Eastern, August 1975	longest DC-9, up to 139 passengers

Series 10: The original version offered around 72 to 90 seats depending on the seating layout. It was designed for short runways and short routes. Some were built as the DC-9-15 with higher weight and as a convertible freight-passenger version. This generation was, for example, the first DC-9 at Swissair and KLM.

Series 20: A special build for SAS. The Scandinavians needed a jet for short runways in the north and got the short fuselage of the Series 10 with the longer wing of the Series 30 and more powerful engines. Only ten were built – the rarest series.

Series 30: The bestseller. The fuselage is around 4.5 m longer than on the Series 10, and the wing somewhat larger. With sub-versions such as the -31, -32, -33 and -34, the Series 30 covered almost everything from scheduled jet to combi to freighter. The military C-9s are also based on it.

Series 40: Another 2 m or so longer, prompted by SAS, which wanted more seats on its dense domestic and regional routes. Besides SAS, the Japanese Toa Domestic Airlines was one of the main customers.

Series 50: The longest DC-9 came only in the mid-1970s. Eastern launched scheduled service in August 1975, and Swissair received its first one in the same month. At around 40.7 m long, the -50 was the direct precursor of the even longer MD-80.

DC-9, MD-80, 717 or One-Eleven?

Most mix-ups happen within the family itself and with British or Dutch contemporaries. The finder helps narrow it down.

Feature	DC-9-30	MD-80	Boeing 717	BAC One-Eleven
Engines	P&W JT8D, slender	P&W JT8D-200, thicker	BMW Rolls-Royce BR715, large and round	Rolls-Royce Spey
Length	around 36 m	around 45 m (MD-81 to -88)	around 38 m	around 28 to 33 m
Cockpit	analog	analog, later partly digitized	glass cockpit	analog
Built	until 1982	1980 to 1999	until 2006	in the United Kingdom until 1982

The British BAC One-Eleven is the closest relative in appearance, but not part of the family. It is somewhat shorter, and its fin and the Spey engines look stubbier. If in doubt, the registration settles it. Very different in appearance is the Boeing 737-200, which fought for the same customers back then: its engines hang under the wings.

The DC-9 in Europe and the DACH region

In Europe the DC-9 became one of the standard jets of the 1970s – especially with airlines that deliberately decided against the Boeing 737. Lufthansa went the other way and was the launch customer of the Boeing 737.

Switzerland: Swissair put its first DC-9s into service in 1966 and expanded the fleet with DC-9-32s and, from 1975, DC-9-51s. In 1988 the last DC-9s were replaced by Fokker 100s. Swissair stayed loyal to Douglas and, together with Austrian, was the launch customer of the DC-9-81 in 1977, which became the MD-80 family. At Zurich Airport the DC-9 was thus part of everyday life for over two decades.

Austria: From 1971, Austrian Airlines standardized its short- and medium-haul fleet on nine DC-9-32s. From 1975 five DC-9-51s were added. Like Swissair, Austrian then switched to the MD-80 early. At Vienna Airport the red-white-red DC-9 was a familiar sight for years.

Germany: At German airlines the DC-9 remained a fringe phenomenon. The leisure airline Aero Lloyd took over three DC-9-32s with 119 seats in early 1982 and later switched to the MD-83 and MD-87. Otherwise the DC-9 came to Germany mainly as a visitor from foreign airlines.

Other European operators: SAS was the launch customer of the Series 20 and 40 and was among the largest European users. KLM flew 6 DC-9-15s and 19 Series 30 aircraft from 1966/1967 until 1989. Finnair took over twelve new DC-9-51s. In the south, Alitalia, Iberia and its domestic sister Aviaco used the DC-9, and in the Balkans JAT Yugoslav Airlines and Inex-Adria. Many of these airlines wore liveries back then that have cult status today – an overview is given in Legendary airline liveries.

Whereabouts: where the DC-9 still flies today

In the USA the DC-9 stayed in scheduled service surprisingly long. Northwest Airlines used large DC-9 fleets until the merger with Delta. Delta Air Lines, already the launch customer in 1965, flew the last scheduled flight with a DC-9 on January 6, 2014: Flight DL2014 from Minneapolis/St. Paul to Atlanta. That ended the type’s major passenger use after almost 50 years.

After that, mainly cargo operators remained. According to Wikipedia, around 30 aircraft of the DC-9 series were still in service in August 2025. The largest share was provided by the Mexican cargo airline Aeronaves TSM with about 20 aircraft. The rest mostly flew as freighters, plus a few aircraft in Africa, including a passenger aircraft at African Express Airways in Kenya. How many of them are still flying in October 2026 can change quickly.

If you want to search specifically, you filter in a tracking service for the codes DC91 to DC95 – DC93 for the Series 30 is the most practical. How to set up notifications for this is explained in Flight tracking: setting up alerts. You can gauge how rare your sighting is with the article How rare is my sighting?.

The DC-9 in museums

If you want to look at a DC-9 in peace, today you mostly find it in exhibitions. A few worthwhile destinations:

• Volandia near Milan Malpensa: The aviation museum shows a former DC-9 of the Italian Air Force with the registration MM62012. More on the museum on the page Volandia, and information on the location in the spot guide Volandia at Milan Malpensa Airport.
• Museo del Aire Madrid: At Cuatro Vientos airfield, the forward fuselage section of the DC-9 EC-BYE is on display. You can find details at the Museo del Aire and in the spot guide Museo del Aire at Madrid-Cuatro Vientos airfield.
• Canada Aviation and Space Museum in Ottawa: The DC-9 CF-TLL is on display here. You plan the visit with the guide to the Canada Aviation and Space Museum.
• Delta Flight Museum in Atlanta: Since April 2014, the DC-9-51 N675MC, which previously flew with Delta, has been standing there.

A forward fuselage in KLM colors – from an aircraft that never flew for KLM – is also on display at Amsterdam Schiphol Airport. In Germany, Austria and Switzerland, according to our research, no complete DC-9 in a museum is known to us. Further storage places for retired jets are presented in the article Aircraft graveyards and boneyards.

Photo tips for the short-haul classic

When the chance of a DC-9 comes up, every detail counts. These points make your photo valuable later for identification too.

How to calculate the light at your spot is explained in Planning the sun position for your photo spot. Which other oldtimers and rarities are worthwhile is shown in Spotting rare aircraft and Recognizing historic aircraft.

Common mix-ups and how to rule them out

Conclusion

The DC-9 made the jet an everyday sight on short routes. T-tail, two slim rear engines and a compact fuselage make for its unmistakable look, and you separate Series 10 to 50 by length. For Swissair, Austrian, SAS and many others it was the backbone of short-haul flying for years, and with the MD-80, MD-90 and 717 its concept lived on into the 21st century. Today every flying DC-9 is a real catch.