Diehl Aviation

When you think of Diehl, you probably don’t picture an aircraft. And that’s as it should be: Diehl Aviation doesn’t build aircraft but a lot of what’s inside them. The light that comes on at boarding, the overhead bin above your seat, the lavatory at the back of the cabin, the water tank beneath it, the oxygen mask above you and some of the screens in the cockpit – all of it may come from one of the plants between Hamburg and Lake Constance. For spotters, that makes Diehl an unusual manufacturer: out at the fence you see almost nothing of it, but on board all the more.

A family-owned group in aviation

Behind Diehl Aviation stands the Diehl group of Nuremberg. The company goes back to an art forge founded in 1902 and remains family-owned to this day. Besides aviation, the group includes defense, metal processing, control technology and measurement technology. Aviation is one of its biggest pillars.

The aviation business grew in several steps. The starting point was electronics: in 2000, the company Diehl Avionik Systeme was formed from parts of Bodenseewerk Gerätetechnik and the Frankfurt plant of VDO Luftfahrtgeräte. In 2006, Nuremberg-based Diehl Luftfahrt Elektronik joined, which even then built cabin lighting – the result has been called Diehl Aerospace ever since and is owned by Diehl jointly with the French electronics group Thales.

A year later, in 2007, Diehl pooled its civil aviation activities under the name Diehl Aerosystems. The biggest leap followed in 2008: Diehl and Thales took over the Airbus plant in Laupheim near Ulm, which specialized in cabin interiors. That turned the electronics specialist into a provider that can outfit entire cabins. Since April 2018, the division has operated as Diehl Aviation, and Laupheim is now its headquarters.

Four business segments, one cabin

Diehl now organizes its offering into four strategic business segments. Together they cover a large part of what an airliner needs inside – from the visible interior to the lines behind the linings.

This breadth is the real selling point. Diehl describes itself as a systems supplier that can offer manufacturers complete cabin configurations, water systems and avionics from a single source. For the aircraft builders, that means fewer interfaces; for Diehl, a close tie to programs that often run for decades.

Light as a trademark

If one topic defines Diehl in particular, it’s cabin lighting. By its own account, the company has been among the world’s leading providers for decades. The best-known milestone: in the Boeing 787, Diehl fitted a widebody with LED lighting throughout the cabin for the first time. What seems normal today – soft color gradients when boarding, a warm light for meals, a bluish night sky on long-haul – was new then.

Modern systems work with lighting scenarios that follow the flight phase, time of day and passengers’ needs. Add accents such as illuminated handrails, contour lighting, lit monuments or airline logos. Diehl tests its systems in its own lighting labs and shows where things could go with concepts such as animated clouds on the cabin ceiling or decor films based on e-ink.

Less glamorous but at least as important is emergency lighting. Diehl has supplied such systems for over 50 years. Modern emergency lights sit almost invisibly between the panels or behind ventilation grilles and store their energy directly in the fixture – which saves weight and maintenance. The cargo hold gets its own light too, so loading and unloading goes faster.

For the Airbus A380, Diehl Aerospace supplied not only the cabin lighting but also the electric door control and the control of the high-lift devices. Why the light is dimmed for takeoff and landing is explained in the article Why window shades, seat backs and lights are regulated during takeoff and landing.

Overhead bins, lavatories and crew rests

The second big pillar is the classic interior. Diehl has developed and built overhead bins above the seats for more than 50 years. You notice how important this inconspicuous component is at the latest when boarding, when every inch of storage space counts. Diehl relies on weight-optimized, recyclable materials.

A good example of such a retrofit project is the Mechanical Lift System. According to Diehl, it reduces the force needed to close a full overhead bin by up to 30 percent – purely mechanically, without electrics and without losing storage space. In April 2026, SWISS became the first European airline to begin retrofitting its Airbus A350 with it; a US airline already uses the system. The crew, who close dozens of heavy bins on long-haul flights, is meant to benefit most.

In lavatories, Diehl counts itself among the leading providers of onboard toilets. A trend of recent years is touchless functions – faucet, flush and soap dispenser respond to motion. Add galleys, which must be as light as possible while fully functional, as well as partitions and storage compartments that Diehl has built for Airbus and Boeing aircraft for over 30 years.

One component most passengers never see is the crew rest compartments. In these compact rest rooms, pilots and cabin crew sleep on long flights, often hidden above the cabin or on the lower deck. Diehl considers itself the global market leader in this segment. The clincher: the more compact the rest room, the more room remains for paying passengers.

Water, air, fire and oxygen

Behind the linings, the Supply Systems segment is at work. Its roots go back to 1946, when Apparatebau Gauting was founded in Gauting near Munich. Today this division develops and manufactures in Gilching and Dresden; in June 2026, Diehl opened a new production hall in Dresden for the segment’s 80th anniversary.

The product range is broad:

• Potable and waste water: from custom-made water tanks to a toilet that Diehl calls the lightest in the world so far. With the ECO Grey Water Reuse System, which reuses water from the hand basins for toilet flushing, a roughly three-month scheduled-service trial ran until April 2026 in two SWISS Boeing 777s.
• Ventilation and cooling: fans and cooling systems, with newer generations working autonomously and saving energy. The air ducts for them come from the Ducting segment. How the air gets into the cabin is explained in the article Cabin air.
• Fire protection: smoke detectors that detect fire in fractions of a second while triggering as few false alarms as possible. Diehl even offers a variant of this for rail vehicles.
• Oxygen: only three companies worldwide build emergency oxygen generators for passengers – Diehl is one of them and offers a standard solution for narrowbody aircraft.

That cabin pressure and oxygen supply are closely linked is shown in the article Cabin pressure, cabin altitude and pressure on your ears.

Avionics with Thales: Diehl in the cockpit

The electronics part of Diehl Aviation is based mainly at Diehl Aerospace in Überlingen on Lake Constance, with further sites in Frankfurt, Nuremberg and Rostock. Together with Thales, Diehl has supplied display systems and control units for the cockpits of Airbus aircraft for a good four decades. Add the integrated modular avionics (IMA), in which dozens of functions converge in one modular computing unit – saving weight and cables.

In the 787, besides the LED lighting, parts of the flight control also come from Diehl Aerospace. For the Airbus A400M military transport, the company developed the modular avionics and an Ethernet-based data network together with Thales. Other fields of work are engine controls, high-lift and fly-by-wire systems and solutions for electrically powered vertical takeoff aircraft (eVTOL).

For the cabin, Diehl developed the CANSAS platform, through which central cabin functions are digitally controlled and monitored. Two Crystal Cabin Awards – 2014 for a decentralized power supply concept, 2017 for data transmission over power lines – show that it is the invisible technology in particular that is a focus. In 2026, another award followed for AURS, a system that makes it easier for passengers with limitations to find their way through the cabin.

Military programs

Diehl is represented in the military sector too. The company names the Eurofighter, the A400M and the Tiger attack helicopter, among others, as programs. It supplies avionics, cockpit displays and mission and weapon system computers. If you want to spot these types, you’ll find tips in the article Spotting the Eurofighter in Germany and in the guide to Wunstorf air base.

Customers and aircraft programs

Diehl supplies the big aircraft manufacturers: Airbus, Boeing, Bombardier, Embraer and Gulfstream. Add airlines retrofitting their fleets, military customers and manufacturers of new aircraft for urban air mobility.

How close the tie is is shown by the manufacturers’ awards: for fiscal year 2025, the Laupheim site received Bombardier’s Diamond Award for quality and delivery reliability for the third time in a row, and Embraer named Diehl one of its best suppliers in 2026 for the third time since 2021. That makes Diehl appear as a possible supplier in business jets like the Global 7500 and regional jets like the E195-E2 too – which components exactly, the manufacturers generally don’t disclose.

Sites: from Laupheim to Mexico

The headquarters is in Laupheim between Ulm and Biberach. Other German sites are Hamburg, Überlingen, Frankfurt, Nuremberg, Rostock, Gilching, Dresden and Donauwörth – the latter in support of Airbus Helicopters. Diehl has been active in Rostock for 20 years, and an engineering center has grown into a development site.

Internationally, Diehl produces in Hungary (Nyírbátor, with engineering in Debrecen) and in Mexico (El Marqués). In July 2026, a new plant opened in Craiova, Romania, on a site of 33,500 square meters. Laminated cabin components, insulation blankets and water tanks are to be made there at first; according to Diehl, production starts in fall 2026 with around 75 employees.

Important for day-to-day business are the customer service and support sites close to the aircraft plants: in Toulouse, where the customer support center celebrated its 40th anniversary in 2026, in Hamburg, in Tianjin, China, in Everett and North Charleston at Boeing, and in Singapore, Dubai and the US state of Alabama.

Where you see aircraft with Diehl cabins

Because Diehl components flow into practically all the big programs, you see them wherever new aircraft are built and delivered. In Hamburg-Finkenwerder, Airbus assembles A320-family aircraft such as the A320neo and fits out cabins – the article Spotting Airbus Finkenwerder has tips, and the guide Plane spotting in Hamburg covers scheduled traffic at Hamburg Airport.

In France, Toulouse-Blagnac Airport is worth a visit, where the A350 and other Airbus types complete their test flights. The Aeroscopia museum is right at the airfield, more in the article Plane spotting in Toulouse-Blagnac. In the USA, the Boeing Future of Flight in Everett is the first address for seeing Boeing widebodies like the 777 fresh out of the hall.

If you want to reliably tell the 787 with its LED cabin from the A350 from outside, you’ll find the key features in the article A350 or Boeing 787?.

Diehl in the competitive field

In the market for cabin and systems technology, Diehl meets big competitors, including system houses like Safran, which also builds cabin interiors, and the air-conditioning and systems specialist Liebherr Aerospace. Often the relationship is more complicated than pure competition, though: with Thales, Diehl is a partner, and many programs spread work packages across several suppliers.

Diehl’s strength lies in the combination: anyone who can supply lighting, electronics, overhead bins, lavatories and water systems at the same time gets involved early in new cabin concepts. Topics like weight reduction, water recycling and digital cabins rank at the very top – they lower fuel consumption and airlines’ costs.

Verdict

Diehl Aviation is the manufacturer whose products you touch on many flights without knowing its name. From electronics companies on Lake Constance, in Frankfurt and Nuremberg, the former Airbus plant in Laupheim and the Gauting supply specialist AOA, a systems supplier has emerged that offers lighting, interiors, water, oxygen and avionics.

For spotters, Diehl is less a subject than background knowledge. It helps you understand why cabins of different aircraft types feel so different, why a 787 glows differently at night than an older jet, and how much German technology is in aircraft from Toulouse, Hamburg or Everett.