I can’t say for sure, because I loaned the book out and never got it back, but I don’t believe he talked about per km traveled.
Twocritics of his book address your question. One states with nothing but authority that per distance, flying is absolutely safer. The second brings up the point that if they have the same risk over time, and one travels a helluva lot faster, then you are spending less time at risk. So you would be correct to think it was safer per km.
I can’t say for sure, because I loaned the book out and never got it back, but I don’t believe he talked about per km traveled.
Two critics of his book address your question. One states with nothing but authority that per distance, flying is absolutely safer. The second brings up the point that if they have the same risk over time, and one travels a helluva lot faster, then you are spending less time at risk. So you would be correct to think it was safer per km.