air connectivity = how quickly and easily people can travel from one country to another, or the number of different air routes that a country or airpot has; connecting it to other destinations or counties/continents. That is the simple description see link for more details. https://www.pwc.com/gx/en/capital-projects-infrastructure/pdf/pwc-air-connectivity.pdf Or type "air connectivity" into google or a search engine, if you want or need more detailed information.