In Canada and the United States, DVFR is an aviation acronym for Defense Visual Flight Rules. It refers to one type of flight plan that must be filed for operation within an Air Defense Identification Zone (the alternative being an IFR flight plan). Flight rules under a DVFR plan are not substantially different from under a VFR plan, except that t...
abbreviation: Defense Visual Flight Rule
Day Visual Flight RulesDefense Visual Flight Rules