All six operate as “public charters,” which means they’re paper airlines that manage the flight schedules and the business matters but outsource the actual flying to airlines that specialize in flying charters.
Operators can cancel a flight up to 10 days before departure for any reason. You can get a refund, but the operator has no responsibility to make alternate arrangements. Within 10 days, the operator can cancel only if it is physically incapable of flying the flight.
Operators can change the schedule—but not the dates or origin/destination cities—and increase the price by as much as 10 percent without your right to cancel or get a refund. Also, a charter flight must be delayed more than 48 hours before you have the right to a full refund.