Mark Zuckerberg, the Facebook CEO, is known for his massive wealth. Yet, when it comes to flying, he keeps things simple. Yes, Zuckerberg does fly private, but not as often as you might expect. Despite his riches, he tends to opt for commercial flights, showing a surprising level of down-to-earthness. Whether it’s a desire to connect with everyday people or a conscious effort to reduce his carbon footprint, one thing is clear: Zuckerberg’s choice to fly commercial sets him apart from other billionaires.