system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How do wings generate lift when flying upside down?
gpt
The force from the wings depends on the direction that they deflect air. Angle em up, they deflect air down. Angle em down, they deflect air up. You can adjust the wing angle by adjusting the orientation of the whole plane.

To keep lift when the plane is upside down, it just needs to be angled up slightly.