The main problems with ideas like these , is that they arnt thought through properly.
1. What defines public transport?
2. Would privately operated bus networks be included?
If not, then the tax system is discriminating against people who rely on private busses to get around.
3. Would country trains be included?
4. Would these include the XPT and GSRs trains.
The entire idea becomes an administrative nightmare to operate.
Are airlines public transport.
Jeez, don't take this so seriously. It was just an idea
To answer your points:
1. Trains, buses, ferries, trams used to move the public around (passenger transport service) for a fee, or fare, for service.
2. As they are today, yes.
3. Of course. Why would I have suggested a levy or tax if rural residents weren't to be included?
4. No, as they aren't included in V/Line fares, so for the same reasons, the answer is no.
As for your last sentence, which I presume is a question, yes I guess you can call airlines public transport. Car pooling and modes of transport (train, tram, ferry, tram) hired out for private use
are not public transport whilst engaging in that hiring.