The world's most decadent private jets double up as winged hotels for an elite group of pampered billionaires, ensuring they fly in the height of luxury.

Whether heading to an overseas meeting or preparing for a five-star getaway, these seasoned travellers wouldn't dream of stepping foot in a first-class cabin on a commercial aircraft. Instead, they have their very own nine-figure jets at their fingertips.

Read on for a peek inside the most expensive private planes ever purchased, boasting everything from 24-carat gold décor to designer interiors. All dollar amounts in US dollars.