Originally Posted by
Xandrios
As long as you get to see the fare class before and check if it earns miles, you should be fine. The difficulty with such flights are often the additional services, eg, making changes to the itinerary after booking. Also you may not be able to upgrade to business class through a voucher as some OTA's issue Aegean tickets on other airlines stock.
Tripsta is the international brand name of travelplanet24.
But how it's possible to issue tickets into other airlines stock with A3 flight numbers if the itinerary only includes A3 flights? Ok, might be possible to issue OA 390-stock as they are "same" company, but not for others. With connections on UA for example it's possible, but don't think only with A3 flights.