Catch 22 for Jet2
I don't doubt that Jet2 could raise the funds to finance a new (as in direct from the factory) fleet, but their business model would struggle to support it, a new fleet would require far higher utilisation than what they could do with their current business model or current fleet. Jet2 do next to nothing in terms of point to point schedule flying outside of a few med destinations.
Whilst their fleet is now quite large, in pax volume they are a millions of pax light compared with Ryanair/easyJet/Norwegian, even Monarch move more and yes i know Jet2 are profitable, but that is probably a lot to do with the low capital cost of their current fleet