1. The step of playing air coaster in Tik Tok is to open the Tik Tok application and enter the shooting interface.

2. Click the "Prop" button in the lower left corner to find the "Flying Car" special effect under the popular or latest category.

3. After selecting this special effect, you can see that a progress bar appears at the top of the screen to control the trajectory of the flying car.

4. Adjust the position and length of the progress bar to determine the starting position and flight trajectory of the flying car.

5. Click the "Shoot" button at the bottom of the screen to start recording video.

6. In the process of recording, the flying direction and speed of the flying car can be controlled to make it fly according to the set trajectory.

7. After recording, you can preview the video effect. If you are satisfied, please click the "Save" button to save it in the photo album.