Jet2 also have spare aircraft lying around all over the country, an unsustainable business model long term with newer, more expensive aircraft now in the fleet.
Continuing off-topic as this thread has become the "TUI Airways delays" thread, easyJet cancelled over 100 flights into and out of Gatwick between last Thursday and Sunday due to and as a knock on from the thunderstorms on Thursday evening. TUI delayed one flight from Thursday until Friday. And this is what happens when easyJet cancel your flight
https://www.mirror.co.uk/news/world-...anded-18791716
For more "unacceptable", than a few 24 hour delays every season.