It’s not fake – it’s called a “paper airplane surfing” trick.
The plane is not flying by itself; it’s gliding on an upward airflow created by the big sheet of paper.
When the person moves the big paper, air is pushed upward, creating lift under the small plane.
As long as that airflow continues, the plane can “surf” and stay in the air for a long time.
If you stop moving the big paper, the plane will fall like a normal paper airplane.
It’s simple physics, not magic.