For the purpose of your financincing an aircraft question, mortgage free or not is totally irrelevant to the solutions available to you. Based on the short personal profile you provided, I made an assumption which by your response still does not tell me if you are or not. For your own purposes it just does not matter!
However, your opinions on demographics as they relate to home ownership in the US, are just that, opinions without a shred of evidential substance to support them. Given the climate, making up s**t is fast becoming the abnormal norm.
FYI: According to a 2017 report by ATTOM Data Solutions, 34% of ALL American homeowners are mortgage free. According to the US census in 2016, the US is a nation of homeowners. Though 100 million rent, they're outnumbered by more than 2 to 1 by those who own their own home. Furthermore, the rate of home ownership has remained almost the same since 1960. In 2018, the rate was 64.2% as compared to 1960 when it was 65.2%.
I tried to give you some advice regarding the better option of a line of credit without collateral but you chose to respond in a manner that is corrosive and irrelevant to your own question. You should swallow your agenda and still look into it as a viable and common sense solution.