The top 10 pilots so far for this tour have flown less than 50 hours total time (all vehicles, aircraft and boats).
Good rule: fly less=die less=rank higher.
note: not saying anything about the pilots, just an interesting observation.
That being said, I wonder if there is not a way to rate people with time weighing more in the mix. I mean, I know that you are rank on "Kills per hour", but that does not weigh very heavily into the final ranking.
For instance, how about a minimum number of hours being flown before being ranked?
Just a thought.