An onboard incident triggered a precautionary security response, sending the Dublin-bound aircraft back to Porto minutes after departure

A Ryanair flight bound for Dublin was forced to return to Porto shortly after takeoff following an onboard incident that triggered a precautionary security response and briefly raised concerns over a potential threat to the aircraft.

According to reports cited by the Mirror, the episode unfolded on Tuesday evening after a 48-year-old woman approached a member of the cabin crew and handed over a series of written notes. The passenger allegedly claimed she was being followed by three individuals and requested that the documents be delivered directly to the pilots.

The communication reportedly prompted immediate concern inside the cockpit. During the incident, the aircraft was said to have transmitted squawk code 7500, the internationally recognized signal associated with a possible hijacking or unlawful interference. The crew subsequently elected to discontinue the flight and return to Porto as a precaution.

Ryanair later confirmed that the aircraft turned back because of what it described as a “false report.” In a statement to the Mirror, the airline said the situation was resolved quickly and without further complications.

Following security checks and an assessment by the relevant authorities, the aircraft departed Porto again shortly before 1:30 a.m. on Wednesday and eventually landed in Dublin around 3:15 a.m., roughly two and a half hours behind schedule.

While the operational disruption proved temporary, uncertainty remains over the circumstances that prompted the alert.

Portuguese newspaper Correio da Manhã reported that the woman was identified by authorities and later allowed to reboard the aircraft, allegedly without police verifying the allegations she had made. Other Portuguese media outlets, however, offered a different account, claiming the passenger was escorted from the airport by law enforcement officers.

The conflicting reports leave key questions unanswered. It remains unclear what led the passenger to make the claims, whether authorities conducted a detailed review of the allegations, and why differing accounts have emerged regarding the outcome of the intervention.

For airlines, however, the response is less ambiguous. In an era of heightened aviation security, even seemingly improbable warnings are treated as credible until proven otherwise. The disruption may have delayed passengers’ arrival in Dublin, but for flight crews facing an unexplained onboard alert, caution is never optional.

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(Photo: © AndKronos)