Also, where do you stop ? You could equally ask....
- Which airline has the best terrorist screening ?
- Which airline has the best contingency fuel policy ?
- Which airline has the best crew training ?
etc. etc. etc.
These questions are asked sometimes of African Airlines, where the standard differs more. In Nigeria, these are some of the issues that have led to Arik acquiring vast market share over the last few years. It is also why some people prefer to go with branded quality airlines, rather than with more sketchy history.