Downwind left- Jet2 have done completely the opposite to the industry over the last decade yet it it has proven successful. It has delivered well for shareholders. Customers have rated their product strongly.
They have access to bookings, yields and customer feedback live and meet government regularly. Relatively speaking they are not desperate for cash. And they may not be able to deliver the customer experience they'd like. I think these are perhaps some of the reasons they are not operating.
I hope your relatives enjoy their holiday.