ATHENS, GREECE () — A major technical malfunction in Greece's air traffic control radio frequency systems disrupted flights nationwide Sunday, leading authorities to impose severe restrictions on the country's airspace. The Hellenic Civil Aviation Authority issued a notice to airmen declaring a "zero rate" for flights in the Athens Flight Information Region due to communication.

ATHENS, GREECE () — A major technical malfunction in Greece's air traffic control radio frequency systems disrupted flights nationwide Sunday, leading authorities to impose severe restrictions on the country's airspace.

The Hellenic Civil Aviation Authority issued a notice to airmen declaring a "zero rate" for flights in the Athens Flight Information Region due to communication.

ATHENS, GREECE () — A major technical malfunction in Greece’s air traffic control radio frequency systems disrupted flights nationwide Sunday, leading authorities to impose severe restrictions on the country’s airspace.

The Hellenic Civil Aviation Authority issued a notice to airmen declaring a “zero rate” for flights in the Athens Flight Information Region due to communication frequency failures at the Athens and Macedonia Area Control Centers.

Takeoffs and landings were halted at airports across Greece, including Athens International Airport, while aircraft already airborne were managed under emergency procedures.

Flight tracking data showed Greece’s airspace largely empty, with many inbound flights diverted to neighboring countries such as Italy, Turkey and Cyprus.

Overflights through the region were partially allowed in some cases.

The disruption began early Sunday morning, affecting thousands of passengers during a busy post-holiday travel period.

Airports reported widespread delays and cancellations, with travelers advised to check with airlines for updates.

Officials described the issue as a technical problem under investigation in cooperation with external providers.

Operations began resuming gradually later in the day, though full restoration was not immediate.

No injuries were reported, and authorities emphasized that safety protocols prevented risks during the outage.

The cause remained unclear, with no indications of external interference.

The importance of the report depends on confirmed records, named authorities and any follow-up statements that clarify the scale, timing and public impact of the development.

The next useful information will be the most direct record available: an official notice, a named statement, an updated dataset, a court filing, a regulator note or a corrected public advisory.