A Swiss Air Force F/A-18 went supersonic during a scramble on Jul. 29 at around 2:50pm local time. The sonic boom was heard in the city of Lausanne.
Peter Gronemann from Switzerland [CC BY 2.0], via Wikimedia Commons
The military says two Hornets took off from Emmen air base in order to check on an aircraft that lost radio contact.
For more information, hit the Source below