In English, which is the international language of business and air traffic?

In the native/official language(s) of the respective countries?

What about a multi-lingual country, like Canada… would their international treaties be in both English and French?

Some combination of all the above?

I think I recall reading once about how a slight mis-translation between languages caused for there to be an incompatibility between the language-specific versions of a treaty between two countries. Is this common?

Topics: business, government, language, communication, international, states, countries, treaties