Originally Posted by craigthemif

I'm not sure any government is saying to its own citizens that they are prohibited from travelling. (or coming home if they are abroad) They simply give advice not to, which then tends to invalidate travel insurances... A full ban is Iron Curtain stuff...

What any government certainly can and are doing is prohibit non-citizens from entering the country. With no foreigners allowed to enter Oz, there won't be much demand for flights either.