We needed a flight from Santorini to Athens.. and the options were Aegean Air or Olympic operated by Aegean Air... so Aegean it was.
Santorini is a tiny airport, and if you’re not flying easyJet the actual gates are off the left side (not clearly marked). Don’t make the mistake of getting into any queue you find, ASK.
Boarding was a busy process but we got onto the bus and away - they are strict on cabin baggage vs what you’ve paid for. Once we were onboard the overhead bins weren’t full though.
Flight was quick, baggage handling as expected.