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Why is FAA diverging from ICAO standards?

April 26, 2017diverging FAA icao Standards

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Why is FAA diverging from ICAO standards?

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FAA will accept ICAO FPLs filed IAW Document 4444 in compliance with ICAO standards. Our software will also accommodate some NAS FP-only conventions for domestic-only ICAO FPLs, such as block altitudes and message assurance responses to a third party; these will be documented in the Flight Plan Filing section of the website. Please refer to guidance on this website at Filing Instructions/Reference Guide/Domestic ICAO FPL. NOTE: Filers are cautioned these conventions should be filed in a domestic-only ICAO FPL, as such FPLs may be rejected by the flight plan systems of other ANSPs.