Aileron and freezer: what they have in common

1. Step 1. Aileron — is part of — Aeroplane. Ailerons.
2. Step 2. Aeroplane — evolved into — Jet airliner. A jet aircraft.
3. Step 3. Jet airliner — has part — Pressurized cabin. A pressurized cabin.
4. Step 4. Pressurized cabin — has part — Compressor. Air is bled from the engine compressors.
5. Step 5. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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