If you are flying on an international flight to or from a EU country, and you are involuntarily placed in a lower class than that which is indicated on your ticket, you may request a reimbursement of the following:
30% for all flights of 1,500 km or less
50% for all flights of more than 1,500 km within the EU and all other flights
between 1,500 km and 3,500 km
75% of the ticket price for all non-EU flights of more than 3,500 km
It is important to know your air passenger rights!