Alerting service is in principle provided to flights for which a flight plan has been submitted.
A single change of an approved RPL shall be submitted as early as possible and not later than 60 minutes before departure in the form of the flight plan.
All changes to a submitted flight plan shall be reported as soon as possible to the appropriate ATS unit. In the event of a delay in departure of 30 minutes or more for a flight for which a flight plan has been submitted, the flight plan shall be amended or a new flight plan shall be submitted after the old plan has been cancelled.