Scurvy, you ask
.. and what 'class' of airspace is than then???
Scurvy, it is Class C airspace. The ICAO classification system states that in Class C, IFR are separated from VFR. Just as in Australia we have different standards to that set by ICAO in many cases – and we have notified a difference – the same applies in the USA. I can assure you that it results in a very safe airspace system that thousands of passengers fly in each year in the USA.