Unfortunately, priority registration service is in development.
Today you can use the following online services, if you have on hand the original ticket purchased (Example of the original route-receipt):
Free transport of luggage allowed in plane: not more than 20 kg per adult passengers. Read more
Meals on board
DutyFree goods on board
Recieve notification about changing flight prices/tickets iFly!
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A new service "Business-hall" is available.