Doctors and pilots. Two professions which require meritocracy. And if quota hiring is demanded by law, do you know who that hurts the most? Any doctor or pilot who fits the quota category but is competent at his job. They will be eyed with suspicion by their patients and passengers. BTW, this story ranks up there with the old ladies gossiping by the fireplace at Hank Rearden’s party in Atlas Shrugged.
And other pilots will be cautious too. If affirmative action is present in hiring, it's also very likely to be present in training -- the weak pilots are protected if they are minorities/women, but the majority pilots (white) are given no special favors (extra training to meet standards, for example). And ditto for violations of company policy. Some are fired and others are given extra chances.