Delays are impacting flights at Greek airports due to issues with approach systems, reportedly stemming from checks originating in Bulgaria. Air traffic controllers and airline representatives are criticizing the Hellenic Civil Aviation Authority (HCAA) management for the disruptions. A HCAA aircraft is currently grounded due to a lack of spare parts, exacerbating the problem. Controllers claim they previously warned authorities about potential vulnerabilities. The situation is causing significant flight delays and raising concerns about the reliability of air traffic infrastructure. The origin of the system checks and the specific nature of the vulnerabilities remain under investigation.