There is simply no substitute for the experience and proficiency of a properly trained pilot.
It is a known fact that the more years of experience a controller has, the higher his proficiency.
But the law also allowed each state to determine its own proficiency standard.
There was a lot of farm labor [in his upbringing], and there was a proficiency in splitting rails.
All kinds of races are easy to arrange and these can be repeated from day to day as your proficiency increases.
Should musical degrees be granted, and if so, for what measure of knowledge or proficiency?
Instead, the four received a sort of special certificate stating their proficiency "in science and the arts."
His belief was that his proficiency in singlestick62 was matched only by his skill in song.
At the age of eight he became a pupil in the grammar school, having already made some proficiency in classical learning.
"I'd rather win a proficiency badge for shooting," grunted Rona.