In the real world all flight plans must be filed in advance, IFR plans 60 mins and VFR plans 30 mins prior to departure. In the virtual world this isn't
always possible. But when it is, why wouldn't you do it?
There is a list below which contains all flight plans filed in advance for Finnish airspace.
Click the callsign and you'll get detailed information about the flight. icon tells you that there is ATC Available on that day. Click the icon and you'll see detailed booking information.