What must be considered for cross-border flights?
When flying to or via another country (cross-border flights) or through controlled airspace, where an ATC-clearance is needed, a flight plan (or at least abbreviated information) is usually mandatory. Further information can be found in national AIPs.
A filed flight plan makes work for any FIS-unit less difficult, as the most important information about a flight is already saved and can be quickly viewed. In some countries a flight plan might be mandatory - even for VFR flights. In some cases (depending on the local regulations), it might be possible to file a flight plan in the air (AFIL). Usually this can be done on the FIS-frequency and it is then distributed to the appropriate AIS.
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Austro Control