Greece: ATC 4-hr strike announced for Aug 5, also possibly Aug 14, 15

4
Aug

Air traffic controllers at airports across Greece have announced a 4-hour work stoppage on 5 August from 14.00-18.00 local time. Further air traffic control strike action is also possible on 14 and 15 August. If you may be affected, please contact your airline or tour operator for advice.

https://www.gov.uk/foreign-travel-advice/greece/safety-and-security