America’s wealthiest individuals are thriving thanks to an imbalance in wealth accumulation that favors the already asset-rich. But even though the number of millionaires and billionaires living in the US has been climbing, and is on track to increase by nearly 700,000 a year between now and 2021 – so long as the market avoids another crash – an influx of new potential buyers has done little to alleviate a supply glut that has been weighing on used jet prices for years.