Yes TOM and TCX operate older models but not into NCL
BHX - Can often be found with at least 2 older TCX 321s & TOM 757s whereas all the based Jet2
aircraft are brand new.
It was never a dig at Jet2 as a company but into NCL they are the oldest by some distance and if you took a side by side comparison of 2 airlines from Newcastle to say PMI and told the customers the age of their Jet2 plane how many of them would get back off ? More than half I would say because the paying folk don't care about its gleaming 30 year old past its still very old for 2017. Now if you told the ones who would get off that their price was now half of what those paid flying that new TCX A321 how many of them would then reboard the 733? You see where I'm going with this the price charged vs equipment used.
Anyway this is all just point of views and opinions but let's keep it related to NCL