Two things worthy of analysis:
- Percentage wise are you safer paxing with a CPL or PPL ?
- Are you safer on a charter flight in a single or a private flight?
If you could work that out it would be interesting.
On one hand you have commercial pressures for the CPL but PPL's on PVT flights often do things and land in places that a chartered aircraft wouldn't thus introducing risk to the flight. But Angel Flight or similar do pose similar commercial pressures on the pilot.