Interesting article here about the worst offenders:
http://www.telegraph.co.uk/news/2017...ed-passengers/
CAA data shows the worst offender for losing cases brought to the CAA was Norwegian, followed by Vueling and Ryanair.
Emirates had an interesting twist - of the cases that were brought to the CAA, they then point blank refused to pay out 74% of the times that CAA ruled they should. United refused to pay in 42% of such cases.