McDonnell Douglas MD-81

Updated: October 2026 – A long, slim fuselage, two engines at the tail, the horizontal stabilizer right at the top of the fin: that is what the future of short- and medium-haul flying looked like in 1980. The McDonnell Douglas MD-81 was the first production version of the later MD-80 family and entered scheduled service in Switzerland and Austria. Here you will learn how the MD-81 came about, what sets it apart from its siblings, which airlines shaped it and how you can still find one today.

What is the MD-81?

The MD-81 is a twinjet narrowbody with one aisle, five seats per row in economy and two pilots in the cockpit. In an all-economy layout, it typically seats 155 passengers, with up to 172 possible. It was designed for short- to medium-haul routes, exactly the European network that airlines like Swissair and Austrian served in the late 1970s.

Technically, it is a heavily stretched DC-9. McDonnell Douglas lengthened the fuselage by about four and a half meters compared with the largest DC-9, the Series 50, enlarged the wing and installed the new, quieter engines of the JT8D-200 series from Pratt & Whitney. On the MD-81, that is the JT8D-209 variant with about 82 kN of thrust per engine.

The name has a history of its own. The project initially ran as the DC-9 Series 80, then as the DC-9 Super 80, and the first production version was called the DC-9-81 or Super 81. Only in July 1983 did McDonnell Douglas introduce the brand names MD-80 and MD-81. In the type certificate of the US aviation authority FAA, the DC-9 designation stayed, and the MD number appears there only in parentheses. That is why you still find the spelling DC-9-81 in old registers and logbooks. You can get an overview of the whole family on the page for the MD-80.

From the Super 80 to the MD-81: how it came about

The starting shot came in October 1977. Swissair ordered 15 aircraft plus five options and counts as the launch customer of the program. Almost at the same time, on October 13, 1977, Austrian Airlines also ordered eight aircraft. Two European airlines that had already had good experiences with the DC-9 thus gave the impetus for the entire family.

The first flight of the first Super 80 took place on October 18, 1979 in Long Beach. The FAA granted certification on August 25, 1980, and on September 13, 1980, Swissair took delivery of the first aircraft. On October 10, 1980, it began: the first scheduled flight led from Zurich to London Heathrow. Austrian followed a few days later, on October 26, 1980, with a flight from Vienna to Zurich.

The MD-81 did not remain the benchmark for long, though. As early as 1981, the MD-82 reached the market with stronger JT8D-217s and a higher takeoff weight. For many customers, especially in the US with its hot airports and full aircraft, it was the more attractive choice. That explains why only 132 MD-81s were built, compared with more than 500 MD-82s. The last MD-81 left the factory in June 1994 and went to a Japanese domestic airline.

Date	Event
October 1977	Orders from Swissair and Austrian, program launch
October 18, 1979	First flight of the first Super 80 in Long Beach
August 25, 1980	FAA certification
September 13, 1980	First delivery to Swissair
October 10, 1980	First scheduled flight, Zurich–London Heathrow
October 26, 1980	First MD-81 scheduled flight at Austrian, Vienna–Zurich
July 1983	Renamed MD-80 and MD-81
June 1994	Last delivery of an MD-81

The three features that are enough to identify it

Identifying the MD-81 itself reliably is a two-step matter: first you recognize the long MD-80, then you pin down the version. For the first step, three looks are enough.

For the second step – MD-81 or MD-82, -83 or -88 after all – your eye will not help you. Here the registration decides. Look it up in a database or watch for the type code MD81 in the tracker. How to read and trace registrations is explained in Understanding aircraft registrations.

The MD-81 compared with its siblings

The differences within the family lie mainly in engine, weight and fuel capacity.

Feature	MD-81	MD-82	MD-83	MD-87
ICAO type designator	MD81	MD82	MD83	MD87
Length	about 45.1 m	about 45.1 m	about 45.1 m	about 39.8 m
Engine	JT8D-209	JT8D-217	JT8D-217/-219	JT8D-217/-219
Max. takeoff weight	about 63.5 t	higher	about 72.6 t	lower
Built	132	539 (+30 MD-82T)	265	75
Launch operator	Swissair, 1980	Republic Airlines, 1981	Alaska Airlines, 1985	Austrian Airlines, 1987

What matters for you as a spotter: the table shows that only the MD-87 clearly stands out on the outside. It is about five meters shorter and has a small extension of the fin above the horizontal stabilizer. Everything else happens under the skin.

MD-81, DC-9 or MD-90?

Outside its own versions, the most common mix-ups are the mother DC-9 and the successor MD-90. The finder helps you narrow it down.

The big competitor of the early 1980s was the Boeing 737-300. It is easy to rule out: its engines hang under the wings, and the horizontal stabilizer sits low on the fuselage. The Fokker 100 does have rear engines and a T-tail as well, but it is clearly shorter and shows its side-opening air brakes at the end of the fuselage.

The MD-81 in Switzerland and Austria

Hardly any other type is as closely tied to the Alpine region as the MD-81. Both launch customers came from here.

Swissair: The Swiss were the first to put the MD-81 into scheduled service, renewing their short-haul fleet with it. According to the fleet overview, Swissair flew a total of 25 MD-81s from 1980 to 1998, supplemented by a few MD-82s and MD-83s. After their time with Swissair, many of the Swiss MD-81s went to SAS and to Trans World Airlines. At Zurich Airport, the red-and-white MD-81 was an everyday sight for almost two decades. Like all Swiss aircraft, their registrations began with HB – more on that in Swiss HB registrations.

Austrian Airlines: Austria’s national airline used the MD-81 from October 26, 1980. The MD-82, MD-83 and the MD-87 were added later, the last of which Austrian was even the launch customer for. The airline upgraded part of its MD-81s to MD-82 standard; the fleet list therefore lists MD-81 and MD-82 together and gives 2005 as the end of their service. At Vienna Airport, the aircraft with OE registrations were thus part of the scene for a quarter century. How Austrian registrations are structured is explained in Austrian OE registrations.

If you collect historic Swissair and Austrian pictures: the liveries of that era are considered classics today. More on that in Legendary airline liveries.

SAS and the MD-81 in Scandinavia

From the 1980s, SAS built up a large MD-80 fleet, and the MD-81 was a fixed part of it. Some came second-hand, among others from Swissair. In the Scandinavian network around Copenhagen, Stockholm and Oslo, the family defined the scene for decades.

An SAS MD-81 became known through an event that is still considered a textbook case in aviation today. On December 27, 1991, the MD-81 OY-KHO “Dana Viking”, built only in 1991, took off as Flight 751 from Stockholm Arlanda, bound for Warsaw with an intermediate stop in Copenhagen. Overnight, clear ice had formed on the wings, which had not been detected and removed during de-icing before takeoff. On liftoff it broke off and was ingested into both engines, which then failed. The crew brought the aircraft down in a field near Gottröra. The aircraft broke into three pieces, but there was no fire, and all 129 people on board survived.

At the end of October 2013, SAS used the MD-80 in scheduled service for the last time. At Stockholm Arlanda Airport and Copenhagen Airport, a sight familiar for decades disappeared. It ended an era in Scandinavia that had begun with the MD-81.

Other operators worldwide

Outside Europe, the MD-81 remained more of a supporting role next to the MD-82. A few names turn up again and again, though:

• Continental Airlines: was among the MD-81 operators in the US and also used other MD-80 versions.
• Midwest Airlines: operated eight MD-81s as well as MD-82s and MD-88s and gave up the MD-80 at the end of 2008.
• Japanese domestic service: The last MD-81 went in June 1994 to a Japanese domestic airline that later merged into Japan Airlines.
• Austral Líneas Aéreas: lost an MD-81 (DC-9-81) on June 12, 1988 on approach to Posadas, and all 22 occupants were killed.

Through resales, many early MD-81s ended up with charter and secondary operators. On top of that came, as at Austrian, the upgrade to MD-82 standard. The trail of individual aircraft is therefore often winding – ideal for anyone who likes researching registration stories.

How to find an MD-81 today

Because the MD-81 has become so rare, spotting works differently here than with current types: less fence, more research.

Retired MD-80s often end up in storage areas in desert regions. What happens there is described in the article Aircraft graveyards and boneyards. More oldtimers and rarities are presented in Spotting rare aircraft and Recognizing historic aircraft.

Where the MD-81 once was at home: spots for memory photos

You will no longer meet the MD-81 itself at these airports. But if you are following in its footsteps or want to recreate old shots, you will know the classic spots of its home airports:

Airport	Connection to the MD-81	Spot tip
Zurich	Swissair base, first scheduled flight 1980	Butzenbüel
Vienna	Austrian base from October 1980	Vienna spotters’ hill
Stockholm Arlanda	Departure airport of SAS Flight 751	Arlanda spotters’ hill
Copenhagen	SAS hub, MD-80 operations until 2013	Flyvergrillen

You will find detailed tips for the airports in the guides Plane spotting in Zurich, Plane spotting in Vienna-Schwechat and Plane spotting in Copenhagen-Kastrup.

Photo tips, should the chance arise

If an MD-81 does turn up, every detail counts. These points make your photo valuable for later identification, too.

• Side view at full length: The stretched silhouette is the trademark and separates the long MD-80 from the MD-87 and DC-9 at a glance.
• Sharp registration: Because the MD-81 looks like an MD-82 on the outside, the registration is your only proof of the version.
• Tail at an angle from behind: This shows the engine nacelles, tail cone and T-tail together.
• Plan the light: A rare visitor seldom comes twice. Check beforehand where the sun will be at arrival time – Planning the sun position for your photo spot helps with that.

Common mix-ups and how to rule them out

Conclusion

The MD-81 was the start of one of the most successful narrowbody families of its time. Swissair and Austrian were the first to put it into scheduled service in 1980, and SAS made it an everyday aircraft in Scandinavia. Against the stronger MD-82, it lost out in sales, which is why it remained a small series of 132. Today it is history in European scheduled service – and every photo of it that you find or take is a piece of aviation history.