"refusal of fear, in anything you do you have to have trust, trust is a motivation to accept something without knowing all the details. Much like faith!
Trust is a by-product of ignorance, not in a bad way, but in the sense that if you don’t know something you have to trust don’t you? If you don’t have trust then that is fear you haven’t been able to surmount." -Gomendosi
Nice! I do see how fear can be antithetical to trust & how trust & fearlessness can both be related to ignorance.
I see it similarly. When I think I trust that something won't happen (like in the sort of examples you provide):
1. I trust that those mechanics & other technicians responsible for the plane itself, the pilot & other crew members & the well trained air traffic controllers since, after all, they are highly motivated to keep the plane from crashing. As for fluky stuff like a drunken Canada goose flying into the engine & causing a crash, a freak accident that makes the wings snap off of the plane, I focus think of the unlikelihood of such an occurrence. For me, fear can be, sometimes, a choice: I choose not to 'feed' fearsome thoughts of crashes.
2. As for the faith part, I'm not good at that. When we flew to Cuba once, I was extremely doubtful of the flight & switched airlines for one with a much better record! Although the likelihood of a crash was still relatively small, that particular airline had one of the worst safety/crash records on the planet. I had neither faith that we'd be lucky nor trust in those who had proven themselves to be less than trustworthy.
Fearlessness & being overly trusting can be a manifestation of some mental deficiency, naivete (inexperience) or plain old foolhardiness: like brash show-off types.
The same, ironically, can be true of fearfulness with the difference that instead f applying to the foolhardy, it applies instead to the wise!
When it comes to trusting people, I tend to do so within specific contexts & incrementally. I trust my daughter to never take money from me BUT I know that if I have either chips or chocolate, it's GONE. I trust that the guy walking towards me isn't a maniac to the extent that nothing in his behaviour would indicate otherwise.
In other contexts, trust is more about my own self-confidence. I trust that I will be able to handle what comes my way.