Here are a few thoughts:
- 'Real' accidents happen much too seldom to be of any real measure, and they would have to be compensated for the number of passenger kilometers as well to be objective. Large airlines may have be involved in more accidents, but they have more aircraft. Many airlines low down on the reports had accidents many years ago.
- Avherald and the like may be good sources but emphasize that they don't report on all accidents.
- Different jurisdictions have different reporting requirements.
What is a fair and unbiased method of measuring airline safety?