Frank,
I can certainly confirm day VFR only operations in NZ during a major eruption. Although the aircraft were nominally IFR category, they operated to VFR rules, because the track of the aircraft between NZCH and NZAA was unknown, and no conventional ATC IFR clearance could be given.
I am referring to large VH- registered RPT, operating non-standard schedules because of the eruptions. My memory says the offending volcano was Mt.Ruapehu.
Tootle pip!!
Bloggs,
Once again, you demonstrate comprehensible by succinctly, that you do not even have a glimmer of understanding of the principles of ICAO CNS/ATM airspace classification.
Have you ever though of taking your blinker off, and having a look at the big wide word that is out there??