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From: Ross Clark <benlizro@ihug.co.nz>
Newsgroups: sci.lang
Subject: International Day of the Air Traffic Controller (20 October)
Date: Sun, 20 Oct 2024 22:49:26 +1300
Organization: A noiseless patient Spider
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On this day in 1961 the International Federation of Air Traffic 
Controllers' Associations (let's see, that's IFATCA, nice and 
pronounceable) was formed.

About 100,000 flights around the world take off and land each day.
(source: "one website" - Crystal - no date given)
I'm willing to believe it, but I think "around the world" is in a place 
which invites misreading.

"Of 28,000 Aviation Safety Reporting System reports, 70% cite problems 
relating to information transfer." (source: "a manual issued by the 
International Civil Aviation Organization" - again no date)

So (as you probably know) the international language of air traffic 
control is: English. (The ICAO established this in 1951.)

But of course it has to be a pretty controlled and regulated 
("ascertained", Jonathan Swift might have said) register of English.
Airspeak (Aviation English). Even native English speakers have to be 
taught it.

https://en.wikipedia.org/wiki/Aviation_communication#English
https://en.wikipedia.org/wiki/Aviation_English

And yes, linguists have become involved:

https://books.google.co.nz/books?id=UitlXwAACAAJ&newbks=0&hl=en&redir_esc=y
https://www.proquest.com/openview/224453740dcdd08a17d058866916b948/1?pq-origsite=gscholar&cbl=2026366&diss=y