Okay, so have you ever seen those flags that are on planes? They are called civil air ensigns. They are like the flag of the plane or airline. They are important because they show which country the plane comes from and which airline it belongs to.
Just like how we have a flag for our country or school, airplanes have flags too. These flags are important because they help people know which country or airline the plane represents. It's like a way of showing off where you come from or who you belong to.
So if you ever see a flag on a plane, you can know that it's called a civil air ensign and it's really important for identifying where the plane comes from and who owns it.