I think this summer Jet2 will be one of the most punctual airlines in the UK
Looking at the punctuality stats for 2012, there is no doubt that Jet2 punctuality was greatly improved compared with previous years. However, they still only made 5th position out of 6 UK Low-cost Airlines. It should also be noted that the Jet2 stats are based on analysis of only 53% of their flights, so their overall final ranking could well go up or down.
Still a long way to go but heading in the right direction.