I have to laugh at that list, Jetstar cant even operate Avalon/Sydney without subsidies, and that's a huge entity with market power to reduce cost per seat. None of the others would support a 737 on a frequency basis that would pay down the fixed op costs. Even if you said they hopped between destinations to keep utilisation high the truth is the main load factors all occurr at similar times and the rest of the week will be losses and marking time.