Here are some of the most exclusive and bizarre airlines in the world.
The German Nude Airlines
It's something of a national stereotype that Germans prefer to do things with their clothes off.
And in 2008, a German travel agency launched the world's first nude airline.
The flights were for a summer day trip from the German city of Erfurt to a Baltic Sea resort.
However, rules were made that passengers needed to be dressed while boarding and getting off the plane, which was probably a relief to the rest of the people at the airport.
VietJet Air: an airline with cabin crew in bikini
Nguyen Thi Phuong Thao, the CEO of VietJet Aviation, became a billionaire from this idea.
It was very controversial, but flight attendants on her planes wearing bikinis worked a treat.
The bold move led to her becoming Vietnam's first self-made female billionaire.
As well as the bikini gimmick, the airline offered flights for less than $50, which means millions of people in the south-east Asian country could suddenly take their first flights.
To be clear, only a handful of flights feature bikini-clad staff.