Logo of the International Civil Aviation Organization (ICAO)

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Ever time we file a flight plan now, IFR or VFR we are using the ICAO flight plan format. Who really is the International Civil Aviation Organization (ICAO) and how were they able to get all of the pilots in the US to follow their format rather than the (much simpler) one we had all been using?

Here is a good article from IFR magazine that explains who ICAO is and what they oversee.