It's true--the slightest choice
Most certainly I would not have ended up living in such a manner that would allow me to squeeze just enough $ each week out of the household budget and the creativity to top it up via other means, that enables me to fly.
My mother's one choice and its innumerable consequences are paralelled in the pilot's minute by minute decisions in the cockpit. Most aviation "accidents" are traced back step by step to unravel the winding yet direct path of the butterfly effect!