From long delays to cramped seats, flying can be an unpleasant experience. The airline you fly with, however, can make a huge difference. AirHelp, which offers legal assistance to passengers filing claims against airlines for delayed flights, has released a global ranking of the 10 best — and worst — airlines in the world. To find the most and least efficient airlines, AirHelp analysed 34 airlines using three key criteria – 1. Quality performance, based on data from airline review site Skytrax.com evaluating the airline product, as well as a rating of the airline experience both onboard and at airports. 2. Delay time, which considers how many flights were on time in the last quarter of 2015. 3. Claim processing, which looks at the airlines’ number of wrongfully rejected compensation claims per quarter, and the amount of time it takes airlines to respond to, handle, and pay out a claim.