The amount of the refund will be calculated based on the price of the ticket for the flight concerned. Problems in the calculation, there is when a ticket price for return flight was paid together or a flight consists of several flights, in which the downgrade but only a partial flight concerns.
If a total price has been charged for round-trip flights and, for example, only the entire return flight is affected by the downgrade, the fare must be halved in case of doubt and only half of the fare for the amount of the refund must be used.
However, if a flight consists of several legs and only one of these legs is affected by the downgrade, the individual ticket price for the affected route is hard to find out. In these cases, a proportionate calculation must be made according to the flight distance of the routes in relation to the total route.