Just for the record, ICAO...
Yeahbut, the "I" stands for "International", which in the minds of some American Daily-Wail-reader equivalents means "European" which in turn means "communist", and is therefore to be avoided like the plague[1], like A4 paper, and like anything other than foot-poundals per fortnight as a system of engineering units for designing spaceships.
In other words for these people anything with "international" in it is simply downright un-American and to be ignored. (Or pehaps shot, with the guns they keep at home for self defence.) Who TF are these "internationals" to be telling free Americans what to do??
[1] Yes I
do know there is more plague in the USA than in Europe.