I love the fact jet2 operates old aircraft but, for example, ex Ansett 733's, the first generation Chinese 752's and to an extent first generation 738's are aircraft that other airlines probably wouldn't have looked into on the second hand.
In the past I've defended Jet2 and their aircraft when their age, etc. Has been criticised, and I did say that LS keep all their aircraft in tip top condition and you'd never guess the age.