I have no Aegean Miles but have enough United Miles to book an award flight on UA's website.
I am confused about the fare class it will book me into ; concerning baggage, seat selection, etc... ???

Aegean has 3 different classes of Economy
I have no Star Alliance "status". On United the ticket shows as Economy X and does show that it includes a checked bag but that looks to have an asterisk and state that is only value for United operated flights which this would not be.

Anyone with experience with this? Is a direct flight from Athens to Italy and would need to check a bag as well as an overhead carry-on (not under the seat bag)