From D-1 to today: the history of German aircraft registrations

D-A…, D-E…, D-H…: registrations with a D and four letters seem so natural today that it feels as if there had never been anything else. Yet the history of German aircraft registrations has seen several breaks. At the start were plain numbers, in 1934 came letters, in 1955 a complete restart followed, and for four decades East Germany was a second German state with a prefix of its own. This article goes through the phases in order – from D-1 to today’s class system – and shows you where you can still meet this history at the fence, at air shows and in museums.

The short answer

German civil aircraft have carried the D as their nationality mark since 1919. Until March 1934, it was followed by a sequential number – D-1 was the prototype of the Junkers F 13. A decree of March 20, 1934, switched to letters. After World War II, German civil aviation lay dormant until the Federal Republic introduced a new registration system on January 18, 1955. Its principle – the first letter after the D equals the aircraft class – still applies today but has been extended several times. East Germany used prefixes of its own in parallel: first DM-, from the early 1980s DDR-.

Timeline: the phases at a glance

Period	System	Example	Special feature
1919–1934	D plus sequential number	D-1, D-366	hyphen optional at first, numbers sometimes reassigned on re-registration
1934–1945	D plus four letters	D-AQUI, D-ACON	existing aircraft were re-registered
1945–1955	largely at a standstill	–	restart only once air sovereignty was regained
since 1955 (Federal Republic)	D plus class letter plus three letters	D-AIMA, D-EFGH	classes adjusted several times, gliders with digits
East Germany	DM-, from 1981/82 DDR-	DM-SEA, DDR-SEW	transition to the D register after 1990

1919 to 1934: registration as a number

When civil aviation got going after World War I, nationality marks were redistributed internationally. Germany simply was not provided for in this first allocation. Because no other state used the D, Germany took it up on its own – and it has stayed to this day. Which prefixes other countries received and how the system works worldwide is shown in the overview of country codes on aircraft.

The registration mark after the D was not a letter combination back then but an ascending number. A first register ran from 1919 to 1920; the procedure was then reorganized in May 1920 and a second Luftfahrzeugrolle (German aircraft register) was set up, which was kept until 1934. The registrations were issued by the then Reichsamt für Luft- und Kraftfahrzeugwesen (Reich Office for Air and Motor Vehicles). At first the hyphen was set at will; only when the numbers became four-digit was a horizontal dash required from July 1930.

D-1: the Junkers F 13

Probably the most famous registration of this period is D-1. It belonged to the prototype of the Junkers F 13, the first all-metal airliner. The aircraft first flew on June 25, 1919, in Dessau and bore the name “Herta.” In July 1919, it was initially registered as D-183. With the reorganization of the register from May 22, 1920, it then received the registration D-1.

The F 13 shapes the picture of this numbers era to this day: an aircraft with the registration D-366 stands in the Deutsches Museum in Munich, and in Dessau, where the F 13 was built, the Hugo Junkers Technology Museum is dedicated to the manufacturer’s legacy. On historic photos from the 1920s you recognize the number registrations immediately: large digits after the D, often without a hyphen.

1934: the switch to letters

After about 15 years and more than 3,000 numbers issued, the change of system came: on March 20, 1934, it was decreed that the numbers be replaced by a letter code. The last known number, D-3463, dates from exactly this month. All aircraft already registered received new registrations.

Since then, the D has been followed by four letters, and the first position says something about the type of aircraft. The big airliners of that time wore D-A: Lufthansa’s Junkers Ju 52, for example, as D-AQUI, the Focke-Wulf Fw 200 “Brandenburg” as D-ACON. That aircraft made the nonstop flight from Berlin to New York in just under 25 hours on August 10, 1938. The limits of the classes at that time are not identical to today’s, though – under current rules a Ju 52 would no longer fall into class A.

Airships had their own, easily recognizable identifiers too: the rigid airship LZ 129 “Hindenburg” was registered as D-LZ129. You will find more about the big Zeppelins in the article on the history of Zeppelins and at the Zeppelin Museum Friedrichshafen.

1945 to 1955: standstill and restart

After World War II, the Allies initially prohibited all German aviation, so for the time being there was no German registration system for flight operations – over Berlin, for instance, only Allied aircraft flew during the Berlin Airlift. The turn came only with the Federal Republic’s regained air sovereignty.

On January 18, 1955, the new registration system took effect. A good two months later, on April 1, 1955, the newly founded Lufthansa began scheduled service. Today the aircraft register is kept by the Luftfahrt-Bundesamt (Federal Aviation Office) in Braunschweig, where it has been since August 1, 1959.

The class system grows

The basic principle of 1955 is unchanged to this day: The first letter after the D stands for the class. The division itself was refined several times, though:

• 1957: Aircraft between 14 and 20 metric tons, until then D-A, got a class of their own with D-B. In the same year D-F was added for heavier single-engine aircraft, and light multi-engine aircraft moved from D-E to D-G.
• 1959: Motor gliders, previously carried under D-E, received D-K.
• 1982: With D-M and D-N came classes of their own for sport aircraft – mainly ultralight aircraft with and without engines.
• 1999: Gas and hot-air balloons, which until then had been registered with names instead of letters, moved to D-O.
• Today: The LuftVZO additionally knows D-U for unmanned aircraft systems that require registration.

Gliders take a special path to this day: behind the D they carry no letters but an identification number, usually four digits. That is reminiscent of the numbering principle of the early years. You can see such identifiers at any gliding field and at the German Gliding Museum on the Wasserkuppe.

Today’s classes at a glance

Class	Type of aircraft	Maximum takeoff mass	Typical example
D-A	airplanes	over 20,000 kg	airliners from regional jets to the A380
D-B	airplanes	14,000–20,000 kg	mid-size turboprops and business jets
D-C	airplanes	5,700–14,000 kg	smaller business jets, historic Ju 52
D-E / D-F	single-engine airplanes	up to 2,000 / 2,000–5,700 kg	trainers, touring aircraft
D-G / D-I	multi-engine airplanes	up to 2,000 / 2,000–5,700 kg	light twins
D-H, D-K, D-L	rotorcraft, motor gliders, airships	–	helicopters, touring motor gliders, Zeppelin NT
D-M, D-N, D-O, D-U	sport aircraft, balloons, unmanned systems	–	ultralight aircraft, hot-air balloons

The full explanation of all classes, their weight limits and the marking rules is in the article German registrations: D-A, D-E, D-K, D-M and all classes. Where exactly the registration must appear on the fuselage and under the wings is explained in Where the registration must be on the aircraft.

The second German state: DM- and DDR-

While the D register started up again in the West, East Germany went its own way. From May 1955 there was also a company called Deutsche Lufthansa there, and from 1958 Interflug was added, which from 1963 was East Germany’s only airline. Its aircraft carried the prefix DM- for a long time: Interflug’s first delivered Ilyushin Il-62, for instance, was DM-SEA.

In the early 1980s, East Germany switched to the prefix DDR-. In 1981 and 1982, both forms were in use side by side. The rear part often stayed the same in structure – a DM-S… became a DDR-S…, as with the Il-62 DDR-SEW. The Airbus A310s that Interflug took over shortly before the fall of the Wall also flew with DDR registrations, for example DDR-ABC.

With reunification in 1990, the DDR prefix was obsolete. The aircraft that kept flying moved to the D register. Interflug’s last scheduled flight on April 30, 1991, from Vienna to Berlin-Schönefeld was flown by a Tupolev Tu-134 with the registration D-AOBC. The whole story of the East German airline is told in the article Interflug: East Germany’s airline.

Military: a world of its own

D registrations applied and apply only to civil aircraft. Since 1968, the Bundeswehr (German armed forces) has used a number system with two groups of digits and a plus sign in between, such as 35+01. Before that, a different scheme of letters and digits was in use. How to read these identifiers is explained in the article on Bundeswehr aircraft registrations.

D-AQUI and D-CDLH: when history meets today’s rules

The change of the system is best seen in the Lufthansa Ju 52 “Tante Ju.” The aircraft was registered as D-AQUI on April 6, 1936, and afterward had an eventful life with registrations in Norway, Ecuador and the USA. When Lufthansa brought it back to Germany in the mid-1980s, there was a problem: under today’s rules, D-A is reserved for aircraft over 20 metric tons, and a Ju 52 does not qualify.

The solution: officially the aircraft is registered as D-CDLH – C for the 5.7 to 14 metric ton class, DLH corresponding to Lufthansa’s ICAO code. On the fuselage it was still allowed to show its historic D-AQUI. Since flight operations ended in 2018, it has stayed on the ground and is now an exhibit. You can read more about the aircraft in the article Junkers Ju 52 – Tante Ju.

For you as a spotter, that means: What is painted on a vintage aircraft does not have to be the official registration. If you want to document a historic aircraft cleanly, check the entry in the aircraft register – how to do that is explained in Looking up the aircraft register. Tips for placing old types can be found under Recognizing vintage aircraft in the sky.

What the history brings you at the fence

Registration history is not a purely archival topic. It helps you in very practical ways:

• Placing vintage aircraft correctly: At air shows and fly-ins you see aircraft in historic liveries. A registration that does not fit today’s class is often a sign of a heritage livery.
• Dating old photos: A number like D-1234 is certainly from before 1934, a DM- from East Germany before the 1980s. That way, pictures from family albums or flea market finds can be roughly placed.
• Understanding life histories: Many aircraft had several registrations over the years. Why that is so is explained in the article on re-registrations.
• Recognizing the system of today’s fleets: Airlines often use contiguous blocks of registrations for individual fleets. Once you know the principle behind it, you read registrations at the fence much faster.

Conclusion

German aircraft registrations tell a piece of national history. Germany took the D for itself in 1919, the first years ran on plain numbers up to D-3463, letters came in 1934, and in 1955 the Federal Republic set up the class system that still applies today and has been extended again and again. In parallel, East Germany flew with DM- and DDR registrations until the remaining aircraft moved to the joint register after 1990. Anyone who knows these phases reads vintage aircraft, museum pieces and old photos with very different eyes. The basics of how registrations are built worldwide are in Understanding aircraft registrations, and ideas for collecting are in the article Collecting registrations.