Agency Adopting The ICAO Format For Filing IFR Flight Plans In an effort to harmonize with the international airspace standards with respect to flight planning, the FAA has transitioned to the ICAO format for IFR flight plan filing. Any operator with an advanced area navigation (RNAV) system who wishes to file any RNAV procedure or any international flight must file using the ICAO format and FAA form 7233-4. (www.aero-news.net) 更多...