This is wrong!!!!!!!
The coral sea airlines case concluded that a flight that was planned for the following day was in fact a scheduled flight, and the route as defined by the flight plan made it a "fixed route". No-one knows what a "fixed terminal" is.
This made it RPT.
Nearly every charter flight in Australia operates this way, but if they prosecuted everyone who did it there would be chaos and ridicule. They use it to put companies out of business when they want to. Selected cases.
This should be better defined. The uncertainty it causes is one of the reasons for the decline of GA. (maybe that is what they want)