Virginia,
It's not really the issue. It's about becoming a bit more flexible and cost effective. Think about EF and that they average 500 hours per year! It's nearly equivalent to part-time at full-time pay.
WW could also become more flexible, for instance disruption agreement, and remove some of its clauses. I was on one of the flights last year when the airport in BKK was closed down. Did you know that several aircraft left without any passengers, leaving them behind, because some of the cabin crew insisted on two local nights as part of the agreement? A few of us in the cabin were willing, along with the flight crew, to take minimum rest and try to get the situation sorted out. No! The vast majority of the crew refused to do so because they were entitled to two local nights. The trips were a lot longer than scheduled which actually meant more time in the hotel.