IATA does many things for the aviation industry in addition to acting as a clearing house, such as training courses for airlines, publishing manuals like this one on dangerous goods:-
https://www.iata.org/publications/dgr/Pages/index.aspx
and this one on ground handling:-
https://www.iata.org/publications/st...ns-manual.aspx
These manuals and the work of the various specialist groups help to standardise procedures across the whole industry.
IATA also works with ICAO, national ANSPs and airports to improve facilities for international aviation:-
https://www.iata.org/whatwedo/workgr...perations.aspx
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