Threats on board: what happens on the ground and in the air when a bomb threat is reported on a plane

A recent surge of bomb threats targeting commercial flights across Europe has led to multiple emergency landings, including flights originating from Porto. When a threat is reported, aviation authorities and security forces use a pre-defined protocol to evaluate its credibility; if deemed plausible, pilots are instructed to divert and land at the nearest airport, with the final decision resting with the flight commander.