Plain English Meaning

When a pilot flies under visual flight rules through airspace that the military watches closely for security reasons, they have to file a special flight plan called DVFR so the country knows who they are and where they're going.

Full Definition

A flight plan filed for a VFR flight that will operate into, within, or across an Air Defense Identification Zone (ADIZ). DVFR procedures allow air defense authorities to identify and track civil aircraft in airspace where unidentified traffic could be treated as a security concern. The flight is conducted under VFR rules but with the additional requirements of filing a , activating it, and reporting as required by .