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Why do aircraft wings look downward and upward? The answer lies in their purpose.
Cargo planes, much heavier than passenger planes, require their wings to angle downward to generate the appropriate lift from the air pressure below. This lift assists in carrying heavy loads.

In contrast, passenger planes are relatively lightweight compared to cargo planes, so they don't need air pressure from below. Instead, their wings are designed to have an upward angle to maintain balance due to their relative lightness.

In simpler terms:

1. Cargo planes have wings angled downward because they're not designed for high-speed flight but for carrying heavy loads efficiently.
2. The downward angle provides more space between the wing and the ground during loading and unloading of cargo.
3. It allows for greater clearance between the wing and the ground to accommodate large engines, preventing them from touching the ground.
4. This wing design, known as "high angle wing," offers excellent aerodynamic efficiency and provides greater stability during flight control.