A flyover of military helicopters and fighter jets marked the start of three security trade fairs at the Brno Exhibition Centre, led by the IDET defense fair. These are the largest in history, with 650 companies from 34 countries participating. IDET ends on Friday, while the concurrent PYROS firefighting technology and services fair and ISET security technology and services fair end on Saturday. President Petr Pavel, Minister of Defense Jana Černochová (ODS), and Chief of the General Staff Karel Řehka are also attending the IDET fair.