Giving wings to their lifestyle, whether it be work, rest or play, is important to billionaires because it helps them to make the best use of their time - as well as making their travel more comfortable.
Not exactly Ryanair indeed.
The study is an interesting look into the behaviors of billionaires towards luxury and travel lifestyle. I didn't read anything that I wasn't already expecting though.
As a reminder, the largest private jet in the world is non other than the …A380, ordered by Prince Al-Waleed bin Talal of Saudi Arabia. Before getting that one, he had a 747-400. The Sultan of Brunei or Joseph Lau of Honk Kong have private 747s.
Below is how Lufthansa Technik envisioned a privatized A380 back in 2011: