Definition
Flight at speeds where the compressibility of air becomes a significant factor in aerodynamic behavior, typically at or near the speed of sound. At these speeds, airflow over portions of the airplane can approach or exceed Mach 1, producing shock waves and changes in lift, drag, and control response that do not occur at lower speeds.
Plain English
Flying fast enough that the air itself starts to behave differently — it begins to bunch up and compress against the airplane, which changes how the airplane flies and handles.
Context Anchor
Seen in airplane handling, performance, and transition training when moving from slower training airplanes to airplanes that fly faster or have more demanding speed limits.
Why Pilots Care
Recognizing entry into high-speed flight lets pilots anticipate and manage handling changes such as Mach tuck or reduced control effectiveness before they become hazardous.
Grounding Statement
In high speed flight, the airplane may cover a lot of ground in only a few seconds, so the pilot has less time to decide and act.
Intuition Check
High speed flight does not just mean “going fast” in a casual sense. In aviation, it means flying at speeds where the airplane’s handling, limits, and pilot workload are affected by that speed.
Example Sentence 1
The chapter on high speed flight explains how shock waves form on the wing as the airplane approaches the speed of sound.
Example Sentence 2
In high speed flight the ailerons lost some effectiveness because shock waves formed over the outer wings.