September 10, 2026 marks 50 years since one of the worst disasters in European aviation history. On the morning of September 10, 1976, two passenger jets collided mid-air near Zagreb, then part of Yugoslavia. All 176 people on board the two aircraft lost their lives.

The crash involved a British Airways Hawker Siddeley Trident (registration G-AWZT) and a Yugoslav Inex-Adria McDonnell Douglas DC-9 (registration YU-AJR). The British Airways flight was operating from London to Istanbul. The Inex-Adria flight was en route from Split to Cologne.

At around 11:14 local time, the two aircraft collided at an altitude of about 10,000 meters. The impact was catastrophic. Wreckage fell near the town of Vrbovec, northeast of Zagreb.

The investigation examined air traffic control operations in detail. Air traffic was heavy, and the systems relied far more on human factors than they do today. The findings pointed to a combination of coordination and communication problems.

Major aviation accidents are painful, but each one brings lessons. In the decades that followed, procedures and technologies were developed to reduce the risk of such collisions, from automated conflict alerts to onboard systems that warn pilots.

Half a century later, the Zagreb disaster remains a reminder of our fragility and of the need for rigor in aviation.

Source consulted: Accident McDonnell Douglas DC-9-32 YU-AJR, 10 September 1976 | Aviation Safety Network