The business is all in the image.
No matter how flyable or not is the zone, when you hear private companies arguing with the regulators, you cannot avoid to think (whether its true or not) the big money passes long before your safety.
It was somewhat amusing to hear, over the air on Radio-Canada, passengers stuck in CYUL for three days complaining about it and how quick they'd love to get home but when they were told this could happen as soon as tomorow, they didn't feel in such a hurry suddenly and one was quite uncomfortable with the idea. T'should give airlines a clue.
It simply doesn't matter if it's safe or not. If the passengers, at any time, feel corporations gamble with their life for the sake of profit, it'll hurt way more than closing the business for a couple more day, or a whole week if need be.