Just got notified by EF that KLM has gutted the ATH schedule. Where there used to be 2-daily flights (12:15PM and 20:30PM from AMS, 06:00AM and 17:20PM from ATH) there is now a one-daily flight with totally different departure times.

Tue, Thu 06:35 AMS-ATH, 11:35 ATH-AMS
Mon, Wed, Fri, Sat, Sun 09:00 AMS-ATH, 14:00 ATH-AMS

So far only for June, seems to be the new temporary schedule till demand has been restored. Of course, that switch back to the regular schedule may shift back from July to August to later..