If the faa and its counterpart agencies in other nations were interested in collaborating to make civil aircraft certification standards globally uniform, what organizations would logically coordinate that effort? where is that organization headquartered?

The International Civil Aviation Organization (ICAO), which is headquartered in Montreal, Canada.

Explanation:

The FAA and its global partners are working to create a worldwide linked ATM  scheme through the International Civil Aviation Organization (ICAO).

The United Nations aviation technical body then offers a platform for the  adoption and implementation of global aviation norms by 192 Member States.

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