I have to watch what I say.
Actually, it's still possible. The problem, however, is this: If the company chartering the flight sells seats to members of the public, it is on the hook for passenger compensation if the flight is cancelled. These big companies charter flights for their employees' travel needs. If there's an issue with the weather, which happens everywhere up north, the company may decide to cancel the flight, even if the organization paid for a service provided by the carrier.
Under the current regulations, if tickets for those seats had been sold to members of the public, the carrier and the company that chartered the flight would be required to compensate those passengers. They would also be required to book them on another flight.