A London Luton–Sofia flight was plunged into a frightening situation on Monday after a bomb threat was reported on board. The Airbus A321neo was urgently diverted to Budapest. The response involved NATO air-defence procedures: a Gripen fighter jet belonging to the Hungarian Defence Forces took off within minutes and escorted the aircraft to the ground. Security checks later confirmed that the threat was false.

(Staff: United Kingdom, Hungary & Bulgaria / Aviation & Security)

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On Monday, 2 November 2026, Wizz Air flight 4302 departed London Luton Airport at 08:33 GMT, bound for Sofia, the capital of Bulgaria. The journey appeared routine until the crew received a bomb threat somewhere over Bosnia and Herzegovina. The aircraft immediately changed course and requested permission to make an emergency landing at Budapest Ferenc Liszt International Airport.

NATO response: “Alpha alert”

The threat triggered an immediate high-level response. According to Hungarian Defence Minister Romulusz Ruszin-Szendi, NATO’s air-defence alert service issued an ALPHA intervention order. Within minutes, a Gripen fighter belonging to the Hungarian Defence Forces took off from Kecskemét Air Base and intercepted the civilian aircraft, escorting it until it landed at Budapest’s main international airport. Source: Xinhua Source: BBC

The Airbus A321neo landed safely at 12:08 local time. After landing, it was directed to an isolated parking area, where firefighters, police officers and members of the counter-terrorism unit carried out the necessary procedures. The airport’s second runway was closed briefly, and air traffic was redirected to the other runway, without major disruption. Source: Observator

“Nothing was found”

After the landing, the authorities carried out the required security checks on the aircraft and its passengers. Wizz Air later confirmed that the inspection had been completed and that nothing had been found. The aircraft was expected to continue to Sofia, while passengers had to wait several additional hours for the situation to be resolved. Source: BBC

According to flight-tracking website FlightAware, the aircraft had been scheduled to arrive in Sofia at 13:25 local time, but landed in Budapest at 12:09 local time (11:09 GMT). The time difference and the security procedures made the delay unavoidable. Source: BBC

A swift, coordinated response

The Hungarian Defence Minister said the operation demonstrated the rapid-response capability of the country’s defence forces and NATO’s air-defence system. “Within minutes, a Gripen fighter belonging to the Hungarian Defence Forces took off and escorted the passenger aircraft,” Ruszin-Szendi said. After the aircraft landed safely, the military aircraft returned to base. Police took over the investigation to establish who had made the threat and why. Source: Xinhua Source: BBC

Conclusion

Monday’s incident highlights a reality of modern commercial aviation: even a false threat can mobilise significant military resources, lead to airport runway closures and cause knock-on delays. For the passengers aboard Wizz Air flight 4302, the journey to Sofia became an unforgettable experience, marked by the sight of a fighter jet suddenly appearing outside their window. The question for the authorities remains: who made the threat, and why? The ongoing investigation is expected to provide answers. The incident also demonstrated the role of NATO’s air-defence system in responding to such situations.