Clearly my reference was to non-commercial flights. See: bush pilot in Alaska.

Many bush pilots charge cash to fly people.

And in the age of pretty good long-distance telemetry, I'm sure that 99% of the time there's not much need for the second pilot in a big jet. It's that 1%.

I've never really thought about it, but I guess I'm a little uncomfortable with noncommercial anesthesiologists and I would prefer that they are supervised.

There’s a lot more to commercial aviation than RPT (Regular Public Transport) operations.

Some of those commercial ops include single pilot IFR in Class G, into dirt airstrips at night.