Iceland’s budget airline WOW Air lands in last place (72nd) in AirHelp’s ranking list of the best airlines in the world, with a total score of 5.04 (out of 10). In comparison, Icelandair takes the 45th seat with a score of 7.38. Qatar Airlines top the list, followed by the German Lufthansa and the Arabian Etihad Airways.

AirHelp uses three equally important criteria to rank airlines, namely the quality of amenities, on-time arrivals, and how well flight delay compensation claims are resolved. Delays of 15 minutes or less are seen as being on time, with a score of 8.5 indicating that 85% of flights arrived on time.

To measure the quality of customer service, AirHelp collects data from public reviews from what they have “identified as some of the most reliable sites in the world”—whatever that means.

The ranking on claim processing includes three categories: claim handling (comparing wrongfully rejected claims with total number of submitted claims), turnaround (time needed to acknowledge and process a valid claim) and pay out.

While WOW Air received mediocre ratings in regard to service and on-time performance, the airline fell through the claim processing category with a score of only 1.7.

AirHelp also has a list exclusively for the largest airlines in Iceland—with Icelandair leading the list, followed by EasyJet in second place and WOW Air in the third.

You can check out the complete rankings here.