
In United States aviation VFR-on-top is defined as air traffic control authorization for an aircraft operating under instrument flight rules (IFR) to do so in visual meteorological conditions (VMC) at any appropriate visual flight rules (VFR) altitude. A pilot receiving this authorization must comply with the VFR visibility, distance from cloud cr...
Found on
http://en.wikipedia.org/wiki/VFR-on-top

Flight in which a cloud ceiling exists but modified VISUAL FLIGHT RULES are in effect if the aircraft travels above the cloud layer.
Found on
http://www.aerofiles.com/glossary.html

Flight in which a cloud ceiling exists but modified VISUAL FLIGHT RULES are in effect if the aircraft travels above the cloud layer.
Found on
https://www.encyclo.co.uk/local/22323
No exact match found.