I vaguely recall that the risks are closer than you'd expect when going by hours of flight, rather than distance. I'm not finding the numbers right now though.

In https://www.pbs.org/wgbh/nova/planecrash/risky.html I did find some older numbers. For commercial carries, it was 1.9 deaths per vehicle mile instead of 1.3.

https://www.pbs.org/wgbh/nova/planecrash/risk-01.html (99 through 03)

However, private planes are more risky and don't seem to be included in those numbers.