Innocent until proven guilty absolutely does not apply in corporate America. That applies to government only.

Now there is a judicial safety valve, if someone is terminated because of something which truly was not their fault they can always sue to get their job back. But the company would probably do the right thing anyway if someone was actually innocent ("not guilty" or insufficient evidence is not the same as innocent).

Airline pilots, especially in the union environment, tend to adopt an entitlement mentality towards their employment. But nobody in the business world, or corporate aviation for that matter, would expect to keep their job after getting arrested and charged with a major crime. Businesses hire folks who will represent their company well, and they expect you to maintain that image in public.