Aeronautical Terms beginning with J

Jet route

A route designated to serve flight operations from 18,000 feet MSL up to and including FL 450.

Jet stream

A high-velocity narrow stream of winds, usually found near the upper limit of the troposphere, which flows generally from west to east.

Judgment

The mental process of recognizing and analyzing all pertinent information in a particular situation, a rational evaluation of alternative actions in response to it, and a timely decision on which action to take.