Aegean Airlines

Pros

• If and ONLY IF you booked a single ticket, Tblisi to Athens to Zurich to Brussels (which is reads like you didn't). The whole thing is a single journey, however they seem to have done what they would have anyway, which is getting you to...
• Aegean treated you very well : 1 delay and 1 cancellation, 2 proactive rebooking resulting in only 8 hours delay is excellent.
• So complain to each, ask for compensation under EU261. And Aegean treated you very well : 1 delay and 1 cancellation, 2 proactive rebooking resulting in only 8 hours delay is excellent.
• Under EU Regulation 261/2004, Article 9 (Right to Care), Aegean Airlines is legally obligated to reimburse you for ALL hotel, meal, and alternative transport costs (€1,300+) regardless of the fact that it was an ATC failure.

Cons

• Aegean airlines was late and Brussels airlines cancelled my rescheduled flight. ... Aegean treated you very well : 1 delay and 1 cancellation, 2 proactive rebooking resulting in only 8 hours delay is excellent.