4. Boeing 747 -430
The owner of this private jet it is Sultan of Brunei and is considered to be the richest monarch in the world. He owns several private jets which he bought this private jet for about $100 and then used an additional $120 million to give it a facelift. The jet has features such as Lalique crystals and washes basins made of solid gold among other features that make this private jet to be worth $223 million.