Anhanh! All this "captain" and "commander", "3 bars" and "4 bars" made me think of those working in General aviation and those instructors carrying those golden 4 bars on their shoulders and being called captain, what happens to them when they move to airline industry? They are downgraded from golden 4 bars (which can be considered an insult) or it's better they don't wear those or the term captain shouldn't be used for them?