"Ron Natalie" wrote in message
m...

You know the answer and you're being obstinate.

The regulations require a flight plan. It is an ABSOLUTE
UNQUALFIED requirement just as the clearance is.

The discretion given ATC is to accept other than full ifr
plans from pilots in the case of popups or californicate TEC
routes.


Of course I know the answer. You said a flight plan is a prerequisite for
the clearance. ATC issues popup clearances to pilots without them having
filed any flight plan beforehand.