ELI5: Explain Like I'm 5

World's busiest passenger air routes

Imagine you and your family want to go on vacation, but you live really far away from your fun destination. Luckily, there are big airplanes that can take you there quickly!

Now, there are certain airplane routes that lots of people take to get to their vacation spots or visit family and friends. These routes are called "passenger air routes."

In fact, some passenger air routes are so busy that they are called the "world's busiest passenger air routes!"

One of the busiest air routes is between Seoul (the capital city of South Korea) and Jeju (a beautiful island off the coast of South Korea). This route is super popular because lots of people want to go to Jeju island for its beaches and hiking trails.

Another really busy route is between Mumbai (a big city in India) and Delhi (another big city in India). Many people need to travel between these cities for work or business.

So basically, the world's busiest passenger air routes are like big highways in the sky, with lots of people going back and forth between certain cities for their fun vacations or important trips.