Definition
The airspeed at which an aircraft is operated during the en route portion of a flight, typically a steady speed selected for efficient fuel burn, engine longevity, and predictable performance between climb and descent.
Plain English
The steady speed you fly at once you've leveled off and settled in for the trip, between climbing up and starting down.
Context Anchor
Seen in aircraft handling, instrument checks, and performance discussions when the airplane is being operated in steady flight rather than during departure or arrival.
Derivation
From the Dutch 'kruisen,' meaning to cross or travel back and forth. In aviation it carries the same idea: the speed used while crossing the distance between departure and destination, not while climbing or descending.
Why Pilots Care
Using the correct cruising speed keeps fuel consumption predictable and prevents the aircraft from flying too fast or too slow for the planned trip.
Intuition Check
Do not read cruising speed as simply “fast speed” or “maximum speed.” Here it means the normal steady travel speed for that aircraft and situation.
Example Sentence 1
After leveling off at 6,500 feet, the pilot reduced power and settled into a cruising speed of 110 knots.
Example Sentence 2
With the correct cruising speed set, the fuel gauges showed the expected burn rate for the remaining distance.