AEGEAN Miles+Bonus members can enter the giveaway, and everyone wins anything between 500 to 2,000,000 free miles. You must enter by December 23, 2022. Aegean Airlines is part of Star Alliance.
You can access this offer on Aegean’s website
https://en.aegeanair.com/milesandbonus/20years/
Click for the full terms and conditions
https://en.aegeanair.com/milesandbonus/20years/terms/