Aegean has put out a notice that there is an issue with Air China awards that can temporarily be booked only over the phone and not on their website.
I am unsure if this is an issue because Air China award availability is still coming up on their website, but I have not tried to issue a ticket (may fail).
You can access Aegean’s page for the notice here.
Aegean’s Notice:
Miles redemption on Star Alliance carriers
We would like to inform you that miles redemption on Air China flights is not available via your Miles+Bonus account at aegeanair.com and Aegean App, due to technical restrictions.
In case you are interested to proceed with redeeming your miles to book a flight with Air China, you may contact Aegean’s Call Center, at 801 11 20000 (from a fixed phone) or at (+30) 210 6261000 (from a mobile phone or from abroad, on a continuous basis, 24 hours a day, seven days a week), without a service fee.
Aegean Award Search:
Air China award space does come up.
You can also select the flights.
I proceeded to the payment screen.
Conclusion
I am surprised about this notice because I came across Air China’s availability on Aegean’s website earlier this week, and it still appears to be there.
There was business availability with another “Chinese” airline from Taipei, and I ticketed on Eva, whose business class is much better, and the lounge at its base fantastic.
You may have to call Aegean if you have trouble with Air China availability or reservation fails to ticket.
