How does the United States "lead the world in air safety" with only one of their airlines (and not one of the major ones) even making the top 10 from a US sourc

How does the United States "lead the world in air safety" with only one of their airlines (and not one of the major ones) even making the top 10 from a US source[1]? Looking back over the years, the US has never hit this metric. Have I misunderstood how it's being calculated? 1. https://www.forbes.com/sites/laurabegleybloom/2024/01/03/ranked-the-25-safest-airlines-in-the-world-according-to-airlineratingscom/ https://www.forbes.com/sites/laurabegleybloom/2024/01/03/ran...