The airplane has changed the world in numerous ways, especially by increasing the speed of travel, aiding international business and making the world more connected and globalized. Before the invention of airplanes, most people would never travel to faraway places because of the sheer amount of time it took to sail across oceans or to drive through countries. The airplane changed that.
In modern times, people can travel much faster. This has lead to the spread of culture, where more people visit foreign countries. The acceleration of travel has also played a large role in the development of international business. Before the airplane, it was very difficult for businesses to operate on an international basis because their representatives couldn't conduct important business deals in person. Now, the airplane has made it possible for business representatives to visit foreign countries and conduct their business abroad, another way the airplane has influenced a more globalized world.
The invention of airplanes also greatly changed the course of modern warfare. Without airplanes, there would be no air force. Planes played a major difference in World War I, and since then, planes have been used to transport soldiers, emergency supplies and spy on enemies abroad. Space travel is also connected to airplanes. Without airplanes, space travel wouldn't have been conceivable. Much of what is known about the universe wouldn't have been attainable without mastering the aeronautics of the planet's atmosphere.