Jet2 considers itself a low cost carrier, although I don't think their prices are low at all, even for short hops you get mut better deals, although they "own" LBA so they may make the prices they want.
From what I get, I'd say around 20% of the bookings I see are Jet2holidays.
The aircrafts concerns me a little. They're having technical problems all the time, and I'm worried it might takes a disaster to make them finally see that it's time to get newer ones. I hope I'm wrong, I love to see those 757 taking off. But they're not getting any younger and 22 years is a long time to keep them rotating all day long, am I wrong?