Yesterday they were advised by Jetstar that their flight had been cancelled. They have been rebooked on a flight next Tuesday - supposedly the next available flight!
Turns out Jetstar kindly refunded their original booking and offered them the Tuesday flight……at twice what they'd originally paid. They are committed to travelling as they were supposed to be at work yesterday.
Yes, I know Jetstar's a low-cost carrier with all that implies but that's a very ordinary way to treat your customers.