Here's why:
* Common nouns refer to general things, not specific individuals or places.
* Proper nouns are specific names (e.g., Boeing 747, American Airlines).
Since "airplane" refers to any aircraft designed for flight, it's a common noun.
Here's why:
* Common nouns refer to general things, not specific individuals or places.
* Proper nouns are specific names (e.g., Boeing 747, American Airlines).
Since "airplane" refers to any aircraft designed for flight, it's a common noun.