September 1

On September 4, 1963, minutes after takeoff from Zürich‑Kloten Airport, Swissair Flight 306—a Convair CV‑990 Coronado—was forced to turn back when smoke and fire were detected in the aft fuselage. The fire spread rapidly, incapacitating the crew and overwhelming the aircraft; the Convair crashed near Dürrenäsch while attempting to return to Zurich, killing all 80 people on board. The accident prompted urgent scrutiny of in‑flight fire risks and contributed to later improvements in materials, detection, and procedures.

In the pre-dawn hours of September 11, 1984, a Tupolev Tu‑154 operating as Aeroflot Flight 3352 landed at Omsk Tsentralny Airport and collided with heavy runway maintenance vehicles that were working on the active strip. The impact tore the airliner apart and ignited a deadly fire; investigators later blamed a chain of human and procedural failures — a cleared runway that was not actually clear, night‑shift fatigue in air traffic control, inadequate lighting and radio contact for ground crews, and systemic weaknesses in how airport maintenance was authorized and supervised.

On September 27, 2014, Mount Ontake, a beloved pilgrimage and hiking mountain in central Japan, produced a sudden phreatic (steam‑driven) eruption near its summit at about 11:52 a.m. JST. The blast sent ash, rock and gas down the slopes, catching hundreds of climbers by surprise and ultimately killing 63 people. The disaster exposed the limits of volcanic prediction, strained rescue teams working under continuing hazard, and prompted changes in monitoring, warning and mountain‑access policies.