A spokesperson at the Ministry of Defense confirmed that two fighter planes did cause a sonic boom by breaking the sound barrier above the Dolenjska region.

According to the Slovenian Armed Forces, NATO planes had responded to a request made by the NATO command in Germany. The fighters were escorting a passenger aircraft through Slovenia’s airspace.

Unconfirmed reports indicate that the passenger plane was a Boeing 747 belonging to the Israeli airline El Al, operating as flight LY002 bound from New York to Tel Aviv. Because of an anonymous bomb threat, military jets had accompanied the 747 from Switzerland onward. According to the German wire service dpa, the first fighters took off at 8:30 a.m. from an air base in Schaffhausen, Switzerland.
The Slovenian Ministry of Defense explains: “This intervention was organized as a result of a foreign aircraft entering NATO’s airspace.” Slovenia does not have any supersonic military aircraft, but local airspace policing is carried out under the auspices of NATO, which means that Slovenian airspace is safeguarded by Italian and Hungarian military planes.