How does air traffic control get gold coins?

At the beginning of the game, there were four airports. Players need to earn gold coins through correct command again and again, and expand your airport with gold coins.

When the "Dream Airport" plane lands, it starts from any exit and slides to the contact road on the tarmac. If the apron is not selected, it will wait in place. The follow-up plane will also wait in the rear. If you commit dangerous behavior, getting off the plane will not be counted in your grades.