"Steven P. McNicoll" wrote in message
ink.net...
The last instruction issued by ATC in this case was "remain clear of the
Class C airspace. That instruction remains in effect until overridden by
another instruction. How can it be any other way?

Well, suppose the pilot returns tomorrow and establishes two-way
communication with the Class C controller. Yesterday's remain-clear
instruction still has not been explicitly rescinded. So is it still in
effect, or can the pilot now enter the Class C?

--Gary