easyJet have stayed reasonably stationary over the last few years at NCL.
Ryanair have decreased their presence at NCL over the last few years.
Jet2 have not expanded like some believe and have in-fact stayed stationary similar to easyJet.
The peak-summer weekly departures by Jet2 over the last few years are as follows:
Aug-17 - 96x weekly departures, 7x based aircraft
Aug-18 - 99x weekly departures, 7x based aircraft
Aug-19 - 100x weekly departures, 7x based aircraft
Aug-20 - 100x weekly departures, 7x based aircraft
EMA, BFS, GLA and EDI have also seen very little expansion from Jet2 over the last few summers in comparison to LBA, BHX, STN and MAN which have had large and continued expansion.
Jet2 are now focused on other markets and seem to be happy to keep their smaller bases the same.
TUI however have steadily increased their NCL presence over the last couple of years, and next year will see a significant increase in flights and another based aircraft.