Definition
A flight condition in which the aircraft maintains a constant heading and a constant altitude, with wings level and no climb, descent, or turn.
Plain English
Flying in a straight line at a steady height, wings level, not climbing or descending and not turning.
Context Anchor
This is one of the first basic flight conditions a student pilot practices, and it is used as a starting point before many other maneuvers.
Derivation
Straight comes from an Old English word meaning stretched out or direct. Level comes through French from a Latin word connected with a balance or even line. Together, the phrase points to flight that is direct in direction and even in height.
Why Pilots Care
It forms the stable reference state from which all other maneuvers begin and is the foundation for instrument flying and precise aircraft control.
Intuition Check
Do not read this as the airplane simply flying by itself. Straight and level flight is an actively maintained condition: the pilot keeps the airplane from turning, climbing, or descending.
Example Sentence 1
Once established in straight and level flight at 4,500 feet, the student trimmed the aircraft and reduced control pressure on the yoke.
Example Sentence 2
Once established in straight and level flight on instruments, the pilot could begin a standard rate turn.