New fleet
Well i assume by new they/you mean an order for new build equipment ? just what are the lead times on new build 737/A320's ? When ZB placed their order nearly a year ago the delivery date was 2018+
I think most of the 737 production is sold out until the Max comes on line in 2017
If they are leasing from a lessor then they will need to fly their socks of year around, not something the current business model allows for and not something that can be done from most of their Northern bases except perhaps Manchester
A mixed fleet will only add to their rostering issues