Say an instructor wants to plan a trip out of the circuit to demonstrate aircraft handling characteristics including unusual attitudes; how do you put that on a flight plan?
I guess this would be interpreted as an erratic flight path and deemed as a security threat.
I can accept that general handling will have to take place outside the zone, but there must be suitable corridors for transit established for all airfileds within the zone. Weather related diversions might be an issue in a narrow corridor though.