Published by Global Banking & Finance Review®
Posted on January 14, 2026
2 min readLast updated: January 19, 2026
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A Greek airspace blackout was caused by outdated systems, not a cyberattack. Authorities and unions call for urgent upgrades to ensure aviation safety.
ATHENS, Jan 14 (Reuters) - An eight-hour radio outage at Greek airports last week that forced authorities to clear the country's airspace and divert dozens of incoming flights was in part due to an outdated communications system, investigators said in a report.
Flights were suspended into and over Greece on January 4 when air traffic controllers lost contact with most planes, including dozens heading for Greek airports, as radio frequencies went down and were replaced by static.
Aviation experts said the incident was unprecedented in the southern European country.
The exact cause of the outage, which occurred when multiple systems fell out of sync, causing a scramble in communications between airport towers and planes, remains unclear, the report from a five-member investigating committee commissioned by the government found.
It ranked the incident as "low risk" regarding flight safety, ruled out a cyberattack and said that pilots and air traffic controllers responded effectively.
However, the Civil Aviation Authority's voice communication system and critical supporting telecommunications infrastructure are based on outdated technology that is no longer supported by manufacturers and lacks operational guarantees, according to the report, which was submitted to Greece's transport ministry and published late on Tuesday.
The report said that Greek telecommunications provider OTE had since 2019 warned the civil aviation authority that its systems needed new circuits. The report called for upgraded transceivers and other changes. It also recommended the creation of a crisis-response mechanism between the civil aviation authority and OTE.
Greece's systems are in line with EU standards, a transport ministry official said in reaction to the report, although the ministry has implemented an upgrade plan expected to be completed in 2028.
But unions, who have been calling for upgrades for years, say the system is dangerous, especially amid a tourism boom with millions of tourists flying to Greece every year. On Wednesday, they said that the report "fully vindicates" their protests.
(Reporting by Renee Maltezou; Editing by Edward McAllister and Sharon Singleton)
A cyberattack is an attempt to damage, disrupt, or gain unauthorized access to computer systems or networks, often for malicious purposes such as stealing data or causing operational disruption.
Aviation safety refers to the measures and protocols in place to prevent accidents and incidents in air travel, ensuring the safety of passengers, crew, and aircraft.
Outdated technology refers to systems or equipment that are no longer effective or supported due to advancements in technology, often leading to inefficiencies and increased risks.
Flight safety encompasses all measures and regulations designed to ensure the safety of aircraft operations, including pilot training, maintenance, and air traffic control procedures.
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