Key takeaways
- The Twin Otter is the classic among STOL commuter aircraft: twin-engine, about 20 passengers, built for short and unpaved runways.
- Fastest way to identify it: strut-braced high wing, fixed gear and two slim PT6 turboprops.
- Three kinds of landing gear: wheels, floats or skis – the seaplane version is ubiquitous in the Maldives.
- Second life: after production ended in 1988, Viking Air brought the type back in 2008; the 1,000th aircraft was delivered in March 2026.
- Rare in central Europe: if you want to see it specifically, plan a trip to island airports like Barra, Saba or the Maldives.
Contents
Profile
| Manufacturer | De Havilland Canada (1965–1988), Viking Air (from 2008), today again under the name De Havilland Canada |
|---|---|
| ICAO type designator | DHC6 |
| First flight | May 20, 1965 |
| Production | 844 built through 1988, restarted from 2008; the 1,000th aircraft was delivered in March 2026 |
| Engines | 2 × Pratt & Whitney Canada PT6A (Series 100: PT6A-20, Series 300: PT6A-27, Series 400: PT6A-34) |
| Length | 15.77 m (Series 300), 15.09 m (short-nose Series 100) |
| Wingspan | 19.81 m |
| Height | 5.94 m |
| Seats | up to 20 passengers (Series 100 and 300), 19 on the Series 400 |
| Max. takeoff weight | about 5.7 t (Series 300) |
| Max. cruise speed | about 182 knots, a good 330 km/h (Series 300) |
| Takeoff distance (STOL, over a 15 m obstacle, Series 400) | about 370 m |
| Landing gear | fixed nosewheel gear, alternatively floats or skis |
Identifying features
Is this really the aircraft type in front of you?
- High-wing aircraft with a diagonal strut between fuselage and wing on each side
- Fixed, non-retractable landing gear – or large floats or skis instead of wheels
- Two slim turboprop nacelles at the front of the wing with three-blade propellers
- Box-shaped, straight fuselage with rectangular cabin windows
- Tall, slightly swept vertical tail with the horizontal stabilizer at the end of the fuselage
- Long, tapering nose with a baggage compartment from Series 200 on – seaplanes and early Series 100 aircraft have a short nose
Updated: October 2026 – A small, angular aircraft comes in on a steep approach over the water, the wings sit on top of the fuselage and are supported by diagonal struts, the landing gear is fixed and the two slim propeller nacelles look almost delicate: that is very likely a DHC-6 Twin Otter. Since 1965 it has flown where larger aircraft cannot go – onto beaches, gravel, snow and water. Here you learn how to identify it with confidence, which series exist and where you need to travel to get it in front of your lens.
DHC6 into the hangar
With Planetrack you log every Twin Otter sighting with photo, registration, airline and spot and put rare types on your wish list. Planetrack is launching soon – join the waitlist and get early access.
What is the DHC-6 Twin Otter?
The Twin Otter is a twin-engine short-takeoff aircraft for 19 to 20 passengers. It was developed from 1964 at De Havilland Canada as the twin-engine successor to the single-engine DHC-3 Otter, which had become known in Canada as a bush plane. The good short takeoff and landing characteristics were retained, while the second engine brought more safety and payload. The first flight took place on May 20, 1965.
The heart of the design is the double-slotted flaps on the trailing edge of the wing, with which the ailerons work together. In addition there is a rugged, fixed nosewheel gear that can be swapped for floats or skis. The aircraft is powered by two Pratt & Whitney Canada PT6A turboprops, in different power ratings depending on the series.
The concept worked: by 1988, 844 aircraft of Series 100, 200 and 300 had been built in Canada. After that production rested for about two decades until Viking Air took over the type certificate and from 2008 built the modernized Series 400. Today the program again runs under the traditional name De Havilland Canada – the same brand that stands behind the Dash 8-400. In March 2026 the 1,000th aircraft was handed over to the Colombian state airline SATENA.
The series at a glance
From the outside the series look alike; the differences lie mainly in engines, cockpit and nose. For spotters the serial number is the key – together with the registration it tells you in any database which year of manufacture you have in front of you.
| Series | Built | Engine | Distinguishing feature |
|---|---|---|---|
| 100 | from 1965 | PT6A-20 | usually short nose, up to 20 seats |
| 200 | from 1968 | PT6A-20 | longer nose with a large baggage compartment (not on seaplanes) |
| 300 | 1969–1988 | PT6A-27 | most successful series with 614 built, long nose |
| 400 | from 2008 | PT6A-34 | Honeywell glass cockpit, composite doors and fairings |
| Classic 300-G | from 2023 | PT6A-34 | development of the 400 with Garmin cockpit and new cabin |
The Series 300 is the Twin Otter you see most often: by far the most-built version, and it still flies with many operators today. The Series 400 went to the first customer, the Swiss operator Zimex Aviation, in 2010 with serial number 845 – so the count continues seamlessly from the old production. New are mainly the modern cockpit, reworked electrics and composite parts in non-structural areas.
In military service you know the Twin Otter as the CC-138 with the Canadian Armed Forces and as the UV-18 in the USA. There too, STOL capability and ruggedness count: supply and rescue flights to remote regions are among the typical tasks.
Practical tip: note the serial number
On the Twin Otter the serial number tells the aircraft’s story. Everything up to 844 comes from the first production run through 1988, from 845 on from the restart. So always note the registration – that lets you look up the serial number reliably later.
The three features that are enough to identify it
The Twin Otter is small but unmistakable once you know what to look for. Three observations are enough.
Look for the wing struts
The wings sit on top of the fuselage and are braced on each side by a diagonal strut. Many comparable turboprops have cantilever wings without a strut.
Watch the landing gear
The gear stays extended in flight – it cannot be retracted. Instead of wheels you often also see large floats or skis, a strong indication of the Twin Otter.
Check the fuselage shape
The fuselage is angular and straight, the nose long and pointed, the vertical tail tall with the horizontal stabilizer at the end of the fuselage – no T-tail as on the Dash 8 or ATR.
If you want to identify aircraft types systematically in general, the guide Aircraft type identification for beginners offers a good method. The registration provides the final confirmation; how to read the prefixes is explained in the article Understanding aircraft registrations.
Twin Otter or something else?
The most common mix-ups happen with other small turboprop high-wingers. The finder helps you narrow it down.
Quick ID: small turboprop high-winger
DHC-6 Twin Otter
Two turboprops, wing struts and fixed gear are the typical Twin Otter picture. Check the nose: long means Series 200 or newer, short points to an early Series 100 or a seaplane.
Dornier 228
A cantilever wing without a strut and retractable gear in side fairings point to the Dornier 228, the most common Twin Otter lookalike.
Single-engine utility aircraft
A single engine in the nose points to a single-engine aircraft like the Pilatus PC-12 or a piston aircraft like the Cessna 172.
ATR or Dash 8
A large high-winger with a T-tail and retractable gear is a regional aircraft – such as an ATR 42-600 or a Dash 8-400.
A size comparison helps too: at just under 16 meters in length, the Twin Otter is much smaller than an ATR 72-600, which measures about 27 meters. Anyone who has seen the two side by side will not confuse them again.
Where to find the Twin Otter
This is where it gets exciting, because in German-speaking countries the Twin Otter is a real rarity. There is no scheduled service with the type in Germany, Austria or Switzerland. Occasionally aircraft show up on ferry flights, research and special flights or at skydiving operations. That is exactly why it is a travel destination for many spotters and a coveted entry in the logbook – more on this in the article Spotting rare aircraft.
The best-known locations, on the other hand, are in spectacular corners of the world:
| Place | Operator | Why it is worth it |
|---|---|---|
| Barra, Scotland | Loganair | Scheduled flights from Glasgow land on a tidal beach |
| Saba, Caribbean | Winair | Runway only about 400 m long, only reachable with STOL types |
| Malé, Maldives | Trans Maldivian Airways | One of the largest seaplane fleets in the world |
| Antarctica | British Antarctic Survey and others | Ski Twin Otters for research stations |
| Colombia | SATENA | Recipient of the 1,000th aircraft for flights to remote regions |
Barra is one of a kind: on the beach Traigh Mhòr, wooden posts mark three strips that form a triangle. That way the Twin Otter can almost always land into the wind. At high tide the strips disappear under water, so the schedule follows the tides.
On Saba in the Caribbean, the runway of only about 400 meters is considered one of the shortest in scheduled service. Winair serves the island from Sint Maarten. If you are traveling to Maho Beach anyway, you will see the small island hoppers there alongside the big jets – including Twin Otters.
In the Maldives, Trans Maldivian Airways, according to publicly available fleet figures, operates a fleet of well over 60 Twin Otters, almost all as seaplanes. If you land at Malé airport, you see the aircraft taking off and landing on the lagoon – a must-have subject for any bucket list.
In Norway, Widerøe was once the world’s largest Twin Otter operator. The aircraft made possible the dense network of short regional runways that still connects villages and small towns in the country today. Other types fly there now, but the Twin Otter remains a piece of Norwegian aviation history.
Fleets and assignments change
Which operators currently use Twin Otters and where shifts with fleet changes and seasonal schedules. Before your trip, check the current schedule and search a tracking service for the type code DHC6.
How to follow such flights live is explained in the guide to flight tracking with ADS-B.
Never miss a Twin Otter
In Planetrack, put the type DHC6 or a specific registration on your wish list and get notified by a sighting alert when an aircraft approaches or lands at your airport. Planetrack is launching soon – join the waitlist.
Planning a spotting trip
Because the Twin Otter flies almost only in remote places, planning is everything. Schedules with few daily rotations, tides or seaplane operations only in daylight make every session unique.
Ready for your Twin Otter tour?
- I found the times of the Twin Otter rotations in the current schedule.
- I know the wind direction and landing direction for my spotting time.
- I know where the sun is and whether I will get backlight.
- My vantage point is publicly accessible and safe – especially on beaches and runway edges.
- I have a suitable shutter speed for propeller blur in mind, and battery and memory card are ready.
On a beach or at a short island runway: keep your distance from the strip and the approach path, and follow barriers and signs on site. What is legally allowed is summarized in the article Is plane spotting allowed?. For planning the light, the guide Planning the sun position for your photo spot helps you.
Photo tips specifically for the Twin Otter
The Twin Otter flies slowly and lands steeply – a gift for photographers, but it requires a few adjustments compared with jets.
Let the propellers turn
With too short a shutter speed the propellers stand frozen, and the picture looks as if the engines had failed. Choose a longer exposure time and pan with it. Exactly how that works is in the guide Photographing propellers: the right shutter speed.
Include the surroundings
Beach, lagoon, snow or rocky coast make the Twin Otter pictures. A shorter lens with plenty of landscape often tells more than a frame-filling close-up.
Show the steep approach
Thanks to the STOL technology the aircraft often comes in at a steep angle. Photographed from the side, this approach becomes the subject of the picture.
Spray and splashes
With seaplanes, impressive plumes of water form on touchdown and takeoff. A short burst at a high frame rate catches the best moment.
Which gear you really need when traveling is covered in the plane spotting gear checklist. And if you are just starting out, the guide Plane spotting for beginners gets you on course quickly.
Common mix-ups and how to rule them out
It points to the Twin Otter if …
- the high-wing aircraft has a diagonal wing strut on each side
- the gear is fixed or floats or skis are fitted
- two slim turboprops sit at the front of the wing
- the tracking service shows DHC6 as the type
Look more closely if …
- the aircraft is only visible from below or in backlight
- the nose is short – then it is an early Series 100 or a seaplane
- the gear sits in side fairings on the fuselage – that points more to a Dornier 228
It is not a Twin Otter if …
- a T-tail crowns the rear
- the landing gear is retracted after liftoff
- only one engine sits in the nose
- you count four propellers – then you may be looking at the C-130 Hercules
Conclusion
The DHC-6 Twin Otter is a workhorse with cult status: since 1965 it has flown to where runways are short, made of gravel or snow – or missing altogether. Struts, fixed gear and the two slim turboprops make it easy to recognize, and the serial number tells its story. It is rare in central Europe – which is exactly what makes it one of the most exciting destinations for traveling spotters, from Barra to Saba to the Maldives.
In short
A high-wing aircraft with wing struts, fixed gear or floats and two slim PT6 turboprops: that is the Twin Otter. If you want to see it, search for DHC6 and plan a trip to the island airports and seaplane bases where it is at home.
Summary
- The DHC-6 first flew in 1965 as a twin-engine development of the single-engine DHC-3 Otter and was built in Canada until 1988.
- Viking Air took over the type certificate and from 2008 built the modernized Series 400; today the type again runs under the name De Havilland Canada.
- Wing struts, fixed gear and the angular fuselage shape set it apart from the Dornier 228, ATR and Dash 8.
- Spectacular locations are the beach airport on Barra in Scotland, the short runway on Saba in the Caribbean and the seaplane base in Malé.
Frequently asked questions
What is the ICAO type designator of the Twin Otter?
All series are listed under the code DHC6. That lets you find the aircraft in tracking services, but it does not distinguish between Series 100, 300 or 400 – for that you need the registration and a look in a fleet database.
What does STOL mean for the Twin Otter?
STOL stands for Short Take-Off and Landing. Double-slotted flaps and ailerons that work together with the flaps allow very short takeoff and landing distances. On the Series 400, according to the manufacturer, about 370 meters are enough for takeoff and about 320 meters for landing over a 15-meter obstacle.
How do I tell Series 100, 300 and 400 apart?
The early Series 100 usually has a short nose; from Series 200 there is the longer nose with a larger baggage compartment. Series 300 and 400 look very similar from the outside; the 400 has a modern glass cockpit and more powerful PT6A-34 engines. You can only separate the series reliably via the registration and the serial number.
Is the Twin Otter still being built?
Yes. After the first production run ended in 1988, Viking Air resumed building in 2008 with the Series 400. Since 2023 the Twin Otter Classic 300-G with a Garmin cockpit has been built. In March 2026 the 1,000th aircraft went to the Colombian airline SATENA.
Where can I see a Twin Otter in Germany, Austria or Switzerland?
Practically not in scheduled service. Occasionally Twin Otters show up on ferry flights, special and research flights or at skydiving operations. Whether one is currently on the move is easiest to check via the type code DHC6 in a tracking service.
Why does the Twin Otter land on a beach?
On the Scottish island of Barra there is no paved runway. The flights from Glasgow land on the tidal beach Traigh Mhòr, where three strips marked with wooden posts form a triangle. At high tide they are under water, so the schedule follows the tides.
Is the Twin Otter related to the Dash 8?
Both come from De Havilland Canada and have Pratt & Whitney Canada turboprops, but otherwise have little in common. The Dash 8-400 is a regional aircraft with a T-tail, retractable gear and up to 90 seats; the Twin Otter is a small, rugged commuter aircraft for about 20 passengers.
Collect the De Havilland Canada DHC-6 Twin Otter, don’t just see it
Post a photo with registration, type, airport and spot, check off the type in your hangar and get an alert when a registration you are looking for lands. Planetrack is launching soon – join the waitlist and get early access.
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Related airports & manufacturers
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Pilatus of Stans has been building aircraft in central Switzerland since 1939 – from the PC-6 Porter bush plane and the PC-7, PC-9 and PC-21 trainers to the single-engine PC-12 and the PC-24 business jet. If you can tell the families apart by propeller, cockpit and tail, you have a head start on any business aviation apron.
Where to see the De Havilland Canada DHC-6 Twin Otter
Specific vantage points with the runway configuration, light times, coordinates and an honest take on whether the trip is worth it.
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- Spotting bucket list: the most legendary plane spotting spots in the world
- How to identify aircraft types: a beginner’s guide
- Aircraft registrations explained: how to read any tail number
- Flight tracking for spotters: using ADS-B, Flightradar and more