For  international travel some airlines now charge passengers seat selection fees. For now, it is mostly European companies and fees start from $25 and up.

The charge is only if you make seat assignment more than 24 hours before departure.

You may choose any of the remaining seats free of charge as soon as check-in for the respective flight begins – usually 23 hours before departure. Please note that selection is limited under these conditions.   We recommend that you check-in as soon as it is possible on-line and get the best available seats at no charge.