The Correct answer to this question is the United States of America.
The country that has the highest number of airplanes in the United States of America. Coming next to America is China. Due to the massive population in China and America, I doubt if you would be surprised if these countries didn’t make it top to the list.
The United States (United Airlines, American Airlines, and Delta Airlines) also doubles as the country that has the most number of destinations.
Compared to its population, Canada also has many airplanes. Other countries with many airplanes include: United Kingdom, Germany, France, Japan, Brazil, Spain, India, Russia, Italy, Turkey, Australia, and the list goes on.