The calendar links French events of November 6 to alerts already recorded earlier in the week and to new cases reported Friday in Prague. Czech and French authorities are treating these alerts as air security incidents under review.
Numerous alerts have been issued since the beginning of the week in Europe. Reports have multiplied across several countries, including France and the Czech Republic.
Matignon is not communicating further on the identity of the airlines, the destination airports or the content of the alert messages. The investigation aims to establish the origin of these reports.
French authorities insist that the four aircraft concerned on Thursday landed without incident. Security inspections continue under the responsibility of bomb-disposal experts.
After false alerts at the beginning of the week, at least twenty flights – mostly from low-cost airlines – had been targeted Thursday in the late afternoon.
The aircraft landed in France without incident, the Prime Minister's office indicates. Bomb-disposal services are carrying out the security inspections.
An investigation is underway to determine the origin of these alerts, the same services add. They do not specify where the planes are located.
The Prime Minister's office specified that the aircraft are being inspected by bomb-disposal experts after an incident-free landing.