Looking for references, this seems realistic. According to Boeing's then CEO Dennis Muilenburg in 2017 "Less than 20 percent of the world’s population has ever

Looking for references, this seems realistic. According to Boeing's then CEO Dennis Muilenburg in 2017 "Less than 20 percent of the world’s population has ever taken a single flight" [0]. I couldn't find a clear figure for how many unique people fly at least once a year. So while the specific number would be up for debate, I think the order of magnitude sounds reasonable. [0] https://www.cnbc.com/2017/12/07/boeing-ceo-80-percent-of-people-never-flown-for-us-that-means-growth.html https://www.cnbc.com/2017/12/07/boeing-ceo-80-percent-of-peo...