None that has any chance of identifying you, unless JetRadar islegally obliged (i.e. by court order or law enforcement agencies) to do so. Even then JetRadar will only be able to disclose the information explicitly outlined in the previous section.
To elaborate on the previous paragraph, JetRadar create lots of reports out of the data that has all identifiable bits stripped out (for instance, to calculate ticket sales volume JetRadar only need the list of ticket prices and not names of the buyers).
Cookies allow JetRadar to improve the website's content, functionality and speed, while their tracking ability also helps JetRadar to understand your likes and dislikes, which means JetRadar can respond quickly and adapt the site accordingly.
In short, a cookie is a small text file that is placed on your computer or mobile device to help ensure that you get the best possible experience when you visit a website.