If your flight meets any of these criteria, you must file an ICAO flight plan:
1. Your flight will enter international airspace, including Oceanic airspace controlled by FAA facilities.
2. Your flight expects routing or separation based on Performance Based Navigation (PBN), ie: RNAV SIDs and STARs.
3. Your flight will enter Reduced Vertical Separation Minima (RVSM) airspace, ie: FL290 or above.
4. Your flight expects services based on ADS-B.