Definition
An IFR clearance authorizing a pilot operating on an instrument flight plan to fly in visual flight rules (VFR) conditions at any appropriate VFR cruising altitude of the pilot's choice, rather than at a specific assigned IFR altitude. The pilot remains on an IFR flight plan and continues to comply with applicable IFR rules, but selects altitude and maintains terrain and traffic separation visually using VFR cloud-clearance and visibility minimums.
Plain English
It's an IFR clearance that lets you pick your own altitude and fly by looking outside, as long as the weather is good enough to do that. You stay on your IFR flight plan, but you fly the airplane the way a VFR pilot would.
Context Anchor
You may see this term in discussions of IFR clearances, cloud layers, and special use airspace procedures, including how ATC keeps aircraft clear of active restricted areas.
Derivation
VFR stands for visual flight rules — the set of rules used when a pilot navigates and separates from terrain and traffic by looking outside. 'On top' refers to flying above a cloud layer in clear conditions. Together, the phrase means flying under VFR-style altitude selection while still being on an IFR clearance, typically on top of clouds.
Why Pilots Care
Allows continued flight with visual references above overcast layers without canceling IFR services or losing separation protection.
Intuition Check
Do not read “on top” as “free to go wherever I want above the clouds.” In this use, VFR on top is a specific ATC clearance, and the pilot still has flight-plan and airspace responsibilities.
Example Sentence 1
After breaking out above the cloud layer, the pilot requested VFR-on-top so they could climb to a smoother altitude.
Example Sentence 2
While operating VFR on top near the restricted area, the crew maintained required cloud clearances and remained in contact with ATC.