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An airliner is an airplane, usually large, used for transporting
An airliner is an airplane, usually large, used for transporting passengers and cargo. Such aircraft are most often operated by airlines. An airliner ...

Sea level is generally used to refer to mean sea level (MSL), an
Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earths oceans from which heights such...

In geometry, Euclidean space encompasses the two-dimensional
In geometry, Euclidean space encompasses the two-dimensional Euclidean plane, the three-dimensional space of Euclidean geometry, and certain other spa...