Tail fins and rudder and shipping container: what they have in common

1. Step 1. Tail fins and rudder — is part of — Biplane. A tailplane and control surfaces.
2. Step 2. Biplane — has part — Wing. Two tiers of wings.
3. Step 3. Wing — is part of — Cargo aircraft. Wings.
4. Step 4. Cargo aircraft — uses — Shipping container. Air cargo containers.

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